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| Number | Title | Issue Date |
| 7386075 | Apparatus for and method of optimizing the performance of a radio frequency receiver in the presence of interference An apparatus for and method of extending the dynamic range of a RF communications receiver. The invention provides a mechanism for controlling the gain of both the LNA and down conversion mixer in the front end portion of an RF receiver. Both the LNA and the mixer a... | 06/10/2008 |
| 7372327 | Input structure for a power amplifier and associated methods A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 05/13/2008 |
| 7161427 | Input structure for a power amplifier and associated methods A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 01/09/2007 |
| 7148745 | Sleep mode recovery One embodiment in accordance with the invention is a circuit. For example, the circuit can include a first stage amplifier coupled to receive a reference voltage. The circuit can also include a second stage amplifier coupled with an output of the circuit and the fir... | 12/12/2006 |
| 7113045 | Power amplifier input structure having a differential output A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 09/26/2006 |
| 7038538 | Folded cascode high voltage operational amplifier with class AB source follower output stage An operational amplifier comprises multiple stages. A differential input stage that includes an adaptive high voltage differential pair generates up and down output currents in response to up and down input voltages. The differential input stage includes adaptive co... | 05/02/2006 |
| 6998915 | Apparatus for switching matching circuit in mobile communication terminal An apparatus for switching a matching circuit in a mobile communication terminal includes a PIN diode connected in parallel to an RF signal input and output line to be turned on and off to connect and disconnect an impedance matching-element to the RF signal input a... | 02/14/2006 |
| 6985039 | Method and apparatus for providing a stable power output of power amplifiers, operating under unstable supply voltage conditions Method and circuit for stabilizing the output power of a power amplifier, operated with signals having a large peak-to-average ratio and fed by a DC power supply with fluctuating output voltage. An allowable fluctuating range for the voltage output from the DC power... | 01/10/2006 |
| 6973399 | Method and circuit for correcting periodic signals of an incremental position measuring system A circuit arrangement for the correction of periodic signals from an incremental position measuring system that includes a first assembly comprising a multiplexer having an input to which a periodic signal is supplied and an output out of which an output signal is t... | 12/06/2005 |
| 6954105 | Disk drive and error amplifier therefor and related methods An amplifier may include an output stage including first and second output transistors, and a biasing stage for generating first and second biasing voltages at control terminals of the first and second output transistors, respectively, based upon a supply voltage an... | 10/11/2005 |
| 6477358 | Method for controlling power gain Method for controlling the power gain for outputting a transmitted signal from a radio device. At the beginning of the transmitted signal, the output power is increased to a preset power level along a preset characteristic curve. At the end of the transmi... | 11/05/2002 |
| 5703910 | Digital radio receiver The present receiver includes a radiofrequency part (RF) coupled to a limiting amplifier (SL) which is in turn coupled to a demodulation means (DM) which recovers a digital signal from a received signal obtained by modulating a carrier signal with this di... | 12/30/1997 |
| 5675611 | Output power control and envelope shaping for a pulsed transmitter Some mobile station cellular networks use either amplitude modulation or constant envelope modulation depending on the situation. The pulsed transmitter of the mobile station is switched on and off by a first control signal (TXP) and the output power enve... | 10/07/1997 |
| 5608756 | Device for identifying traffic on a paired cable The invention relates to a device identifying traffic on a cable. The different types of traffic are characterized by different levels and frequency ranges. The device includes a limiter connected to the paired cable and delivering an output signal having... | 03/04/1997 |
| 5606284 | Automatic gain control device for producing constant amplitude output signal A variable gain amplifying circuit is controlled by a control voltage Vc from which a high-frequency component has been removed. To provide the control voltage Vc, a holding circuit smoothes the higher one of an output voltage of the variable gain amplify... | 02/25/1997 |
| 5349304 | Operational amplifier having multiple positive inputs An operational amplifier input stage has at least two positive input transistors and one negative input transistor for providing more accurate and efficient limiting or rectification in limiter and rectifier circuits. The two positive input transistors ar... | 09/20/1994 |
| 5341114 | Integrated limiter and amplifying devices Integrated circuit structure and processing is provided for a high power limiter including at least a first anti-parallel array of monolithically integrated Schottky diodes. In a further embodiment, integrated circuit structure and processing is provided ... | 08/23/1994 |
| 5334945 | Power control circuit A power control circuit for use in radio transmitters such as portable telephone sets includes a power amplifier for amplifying the power of a transmission signal to obtain an output signal; control circuits for controlling the amplitude of the signal out... | 08/02/1994 |
| 5260973 | Device operable with an excellent spectrum suppression In a device for use in processing a baseband input signal and a carrier signal into an envelope output signal, a processing unit (3) is supplied with the baseband input signal and the carrier signal and produces, as a produced signal, a modulated signal a... | 11/09/1993 |
| 4747159 | RF modulator An RF modulator is characterized by a gain adjusting circuit for gain adjustment incorporated with an RF amplifier for amplifying a carrier wave provided from a carrier oscillator and applying the same to a video signal modulator and to an audio signal mi... | 05/24/1988 |
| 4598255 | Power amplifier apparatus Audio power amplifier in which dynamic power output can be increased without increasing continuous power output. The apparatus includes an amplifying means for receiving an input signal and for producing an amplified output signal, first means for supplyi... | 07/01/1986 |
| 4574248 | RF Power amplifier for use with VHF transceivers An improved power amplifier is disclosed which is particularly useful with very high frequency (VHF) transceivers. The power amplifier includes a control loop configured to sense the input radio frequency signal and use that signal as a reference for comp... | 03/04/1986 |
| 4562407 | Automatic regulation of the output power of an amplifier The present invention relates to a method for automatically regulating the HF output power of a high frequency amplifier wherein a regulating voltage is utilized to produce a control voltage or a control current for controlling the gain of the amplifier, ... | 12/31/1985 |
| 4243944 | Circuit for automatic dynamic compression or expansion The invention relates to a compander system. In such a compander system an adjusting member in the useful signal path is controlled by a control voltage which is generated in a branch path connected to the useful signal path and including at least one fur... | 01/06/1981 |
| 4112384 | Controlled recovery automatic gain control amplifier An automatic gain control amplifier having a controlled recovery of gain is disclosed and includes a peak detector for generating an output when the amplifier output exceeds a predetermined level, a memory setting circuit responsive to the peak detector o... | 09/05/1978 |
