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| Number | Title | Issue Date |
| 7386288 | Input signal detecting apparatus and method An input signal detecting apparatus and method in a digital receiver is provided. The input signal detecting apparatus includes an outer AGC for receiving an input signal and thereby controlling gains of RF and IF AGC amplifiers and generating an IF AGC gain value; ... | 06/10/2008 |
| 7356322 | Multiple-branch wireless receiver A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detect... | 04/08/2008 |
| 7352310 | Receiving device and automatic gain control method A receiving device includes a receiver; a frequency converter; an A/D converter; and a digital signal processor, wherein the A/D converter includes a variable gain amplifier adjusting a signal level of the analog signal from the frequency converter; an A/D convertin... | 04/01/2008 |
| 7257383 | Method and system for improving dynamic range for communication systems using upstream analog information The receiver is provided which comprises a mixer, a low pass filter coupled to the mixer and a plurality of gain controllers serially coupled to an output of the low pass filter (LPF). A plurality of analog-to-digital converters (ADCs) is coupled so that an input of... | 08/14/2007 |
| 7127262 | Method for determining field strength The document specifies a method for determining field strength which can be used in mobile radio systems, such as Bluetooth. The principle proposed involves alternate transmission and reception in the mobile radio system, with each timeslot comprising at least one t... | 10/24/2006 |
| 7116963 | Simplified high frequency tuner and tuning method A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the chan... | 10/03/2006 |
| 7088765 | Vector calibration system An exemplary signal processing system determines vector mismatch between a plurality of signal paths. Advantageously, the system can determine mismatch across a range of frequencies. A signal generator of the system can provide a periodic calibration signal having a... | 08/08/2006 |
| 7082294 | Self-adaptive frequency band-pass filtering device in microwave signal transceiver The present invention relates to a self-adaptive band-pass filtering device in a microwave signal transmitter and/or receiver, the receiver being connected to a microwave signal receiving antenna connected to the input of a low-noise amplifier, a mixer that receives... | 07/25/2006 |
| 7076223 | Gain control device for packet signal receiver In a gain control device for packet signal receiver, a variable gain amplifier amplifies an input signal with a gain corresponding to a control voltage applied thereto, and a power detector detects output power of the variable gain amplifier. A packet detection circ... | 07/11/2006 |
| 7068798 | Method and system for suppressing echoes and noises in environments under variable acoustic and highly feedback conditions Method and system for canceling echoes and noises in environments with variable acoustic conditions and high feedback, such as the interior of an automotive vehicle, permitting audible communication between the occupants, comprising one/several microphone/s (1 | 06/27/2006 |
| 7010284 | Wireless communications device including power detector circuit coupled to sample signal at interior node of amplifier A multi-stage amplifier is coupled with a power detector. The multi-stage amplifier includes a plurality of amplifier stages in series, with a signal path extending through them. The power detector is coupled to an interior node of the amplifier along the signal pat... | 03/07/2006 |
| 7005922 | Variable gain amplifier circuit and gain control method thereof In order to rapidly control the gains of a plurality of variable gain amplifiers VGAs, each of gain control circuits is configured to determine a gain to be set therein, based on gain control information received from other gain control circuits existing in its prec... | 02/28/2006 |
| 6993100 | Burst detector A system for detecting a burst in a wireless communications system. A signal strength indicator indicates the strength of an incoming signal representative of incoming packets. A signal strength change detector detects changes in the signal strength of the incoming ... | 01/31/2006 |
| 6993305 | AM receiver with audio filtering means An AM receiver includes an audio filter that is configured to selectively narrow the audio bandwidth of the demodulated signal when a signal with a low signal-to-noise ratio is received. By suitably bandpass-filtering the signal, for example, to 200–5000 Hertz, th... | 01/31/2006 |
| 6973290 | Radio architecture A digital radio transceiver integrated circuit includes MOS transistors with normal threshold voltages in the digital circuits, and with reduced threshold voltages in at least some of the analog RF components. This allows the transceiver to be reduced in size and we... | 12/06/2005 |
| 6941121 | Method for calibrating a DC offset cancellation level for direct conversion receivers A method for measuring a difference in DC offsets associated with different gain settings in a direct conversion receiver having a variable gain is provided. In a first phase, a set of response parameters that characterize a time-dependent system response to a known... | 09/06/2005 |
| 6931242 | Down converter using C/N ratio correcting circuit of base station for mobile communication network A down converter using a C/N ratio correcting circuit of a base station for a mobile communication network includes: a first splitter for splitting an RF signal applied from an antenna; a VGA for controlling the gain of the RF signal split by the first splitter; a d... | 08/16/2005 |
| 6912380 | PLL circuit and wireless mobile station with that PLL circuit In a PLL circuit, and a wireless mobile station with that PLL circuit, an LPF charging constant current source, a discharging constant current source and a high-speed charging constant current source are connected to an output terminal of a phase comparator with cur... | 06/28/2005 |
| 6718165 | Apparatus and method for reducing nonlinear distortion in an automatic gain control system A mobile communication system having an AGC (Automatic Gain Control) function includes an apparatus for adaptively controlling an output level of a local oscillator to reduce nonlinear distortion which may occur when a high-power RF signal is received or when it is ... | 04/06/2004 |
| 6704555 | Apparatus and method for calibrating local oscillation frequency in wireless communications According to a disclosed embodiment, a receiver comprising a digital rotator in combination with a frequency error discriminator in a digital automatic frequency control loop is used to arrive at accurate digital values used to calibrate a local oscillati... | 03/09/2004 |
| 6671336 | Gain controller for circuit having in-phase and quadrature channels, and method In a radio circuit (299) that forwards a signal pair (I,Q) by a first channel (291, I) and by a second channel (292, Q), a gain controller (200) monitors differences between the overall gains (GI, GQ) in the channels and corrects a g... | 12/30/2003 |
| 6552683 | Method of obtaining a transmission gain function Method of obtaining a transmission gain function for an array of antennae communicating to a telecommunication terminal. The method includes determining a first weighting vector bu maximizing on reception by the array a ratio (C/(Iu ... | 04/22/2003 |
| 6532358 | Overload distortion protection for a wideband receiver Overload distortion protection for a wideband receiver having a wideband variable gain input amplifier followed by a frequency conversion stage followed in turn by an intermediate frequency amplifier and detector to produce a measurement value in response... | 03/11/2003 |
| 6348955 | Tuner with switched analog and digital demodulators A television receiver includes a tuner for receiving either analog or digital signals. Separate analog and digital demodulators are selectively coupled to the tuner through an RF switch that is controlled by a sync detector in the output of the analog dem... | 02/19/2002 |
| 6324387 | LNA control-circuit for receive closed loop automatic gain control A controlled receive device is disclosed having an amplifier circuit, which receives an input signal, and a control circuit which receives the input signal and outputs a controlled signal to a receiver. The receiver outputs an output signal. A controller ... | 11/27/2001 |
| 6184751 | Amplifier circuit An amplifier circuit (20) uses a series transistor (38) to couple the output of an amplifier (26) to a tuned circuit load (40) and to act as a variable resistance. In one embodiment for a multi-band receiver, multiple series transistors (38, 42) are switc... | 02/06/2001 |
| 6070062 | Mobile radio wave receiver with adaptive automatic gain control A mobile radio wave receiver including an automatic gain control amplifier, an electric field intensity detection circuit, an error correction circuit, and an error correction error detection circuit is disclosed. The automatic gain controlling is selecti... | 05/30/2000 |
| 5995816 | Frequency hopping communications receivers In a frequency hopping communications receiver an automatic gain control process in which the mean signal strength of bursts of different frequencies and co-channel interference are detected, a weighted average based on the signal strength and co-channel ... | 11/30/1999 |
| 5940143 | High-definition television signal receiving apparatus and gain control circuit thereof An automatic gain controlling circuit and a high-definition television signal receiving apparatus includes an input terminal for receiving a signal including first and second signal components creating interference, a first automatic gain controlling ampl... | 08/17/1999 |
| 5907823 | Method and circuit arrangement for adjusting the level or dynamic range of an audio signal The invention relates to a method and a circuit arrangement for adjusting the level and/or dynamic range of an audio signal in a transmission system and particularly in a mobile station. According to the invention, the level of acoustic noise in the envir... | 05/25/1999 |
| 5758274 | Radio frequency receiver with automatic gain control The receiver for receiving data carried by the carrier frequency signal and, in a heterodyning system, for downconverting the received signal to a suitable intermediate frequency signal. The modulator and the downconverter are formed on a single semicondu... | 05/26/1998 |
| 5740524 | Feed-forward RSSI assisted radio frequency amplifier power control A selective call receiver (100) includes a radio frequency amplifier (202) having an output power level that is controllable. A radio frequency level sensor (500) generates a sensor output signal in response to an input signal level received at the radio ... | 04/14/1998 |
| 5519888 | Receiver incorporating an other users noise simulator (OUNS) for use in a communication system A received signal is provided to an automatic gain controller which normalizes the received signal to a known voltage level. The automatic gain controller is also provided with an OUNS noise signal through a voltage controlled attenuator. The voltage cont... | 05/21/1996 |
| 5513386 | Receiver for a cellular mobile radio communication system A receiver for being mounted on an automobile telephone or similar mobile station which is included in a cellular mobile radio communication system. The receiver has a high frequency amplifier for amplifying a received input wave, and a mixer for converti... | 04/30/1996 |
| 5465408 | AGC circuit for operating in accordance with the nature of the interference signal and method for controlling this circuit A controller for AGC recognizes a signal level broader than an AGC control output from an AGC circuit and also recognizes a signal level (a desired station signal level) in a narrow-band by an output from an S-meter. No interference, or the occurrence of ... | 11/07/1995 |
| 5428824 | Radio transceiver capable of avoiding intermodulation distortion A radio transceiver comprises an RF amplifier and a first frequency mixer which converts an amplified RF signal into a first IF signal and whose output may include intermodulation distortion. A second frequency mixer converts the output of first frequency... | 06/27/1995 |
| 5408698 | Radio tele-communication device having function of variably controlling received signal level A level changing circuit is provided in a reception signal path for a radio signal and a level detection circuit and a pulse width modulation circuit are provided in a gain control circuit. A level corresponding to the amplitude level of a signal processe... | 04/18/1995 |
| 5369792 | AGC circuit of FM front-end portion for controlling bandwidth detection sensitivity According to this invention, there is disclosed an AGC circuit of an FM front-end portion, including an attenuator for attenuating an input signal in accordance with a level of a first signal, an amplifier for amplifying the input signal in accordance wit... | 11/29/1994 |
| 5345504 | Differential compensation control for off-premises CATV system A off-premises CATV system includes a compensation control including a picture carrier controlled automatic gain control and an automatic slope control. A broadband television signal output from a variable gain device is distributed by a radio frequency s... | 09/06/1994 |
| 5321851 | Radio receiver comprising automatic gain controlling function A cross modulation interference free AM radio receiver with precise channel selection includes an RF amplifying circuit for a radio frequency (RF) signal incoming through an antenna (1; 101) to output a wide band RF signal and an automatic gain control (A... | 06/14/1994 |
