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| Number | Title | Issue Date |
| 7277682 | RF passive mixer with DC offset tracking and local oscillator DC bias level-shifting network for reducing even-order distortion An apparatus and method for tracking a DC offset in a mixer circuit used in wireless communication systems and for providing local oscillator DC bias level-shifting to reduce even order distortion resulting from the DC offset is described. The apparatus has an input... | 10/02/2007 |
| 7245895 | Attenuator with switch function and mobile telephone terminal device using the same A high frequency part, which amplifies a high frequency signal outputted from an intermediate frequency part and supplies to an antenna, is equipped with a gain controller with switch function. The gain controller with switch function comprises an attenuator with sw... | 07/17/2007 |
| 7228109 | DC offset reduction in radio-frequency apparatus and associated methods A radio-frequency receiver circuitry includes a down-converter circuitry, an analog-to-digital converter circuitry, and a DC offset reduction circuitry. The down-converter circuitry accepts a received radio-frequency signal and processes the radio-frequency signal t... | 06/05/2007 |
| 7127224 | Baseband circuit incorporated in direct conversion receiver free from direct-current offset voltage without change of cut-off frequency A base band circuit forms a part of an automatic gain controller incorporated in a direct conversion receiver, and includes a series of variable gain amplifiers controlled by a gain controller and a feedback loop connected between the output node and the input node ... | 10/24/2006 |
| 7035346 | Method and apparatus for desensitization of a wireless receiver A receiver desensitization system sets the sensitivity of a receiver by injecting a desensitization signal appearing as noise onto a receive path of the receiver to adjust the noise power level relative to the power level of signals on the receive path. For example,... | 04/25/2006 |
| 7003272 | Radio apparatus with adjustable reception quality A radio apparatus (95), particularly for mobile radio, which makes it possible to adjust the signal reception in a predeterminably optimized way is proposed. The radio apparatus (95) includes a receiver part (1) and an evaluation unit (5)... | 02/21/2006 |
| 6701139 | Code converter and a system using same A converter operative in a digital telecommunication system to receive signals coded at a first compression mode and convert them into a second compression mode. The conversion provided, leads to substantially less impairments in the decompressed form of ... | 03/02/2004 |
| 6463268 | ALC circuit receiver with sensitivity switching for controlling A radio receiver of the is provided with a local oscillation circuit, a mixing circuit to perform a frequency conversion from a received signal into an intermediate frequency signal by using an oscillation signal generated by the oscillation circuit, an A... | 10/08/2002 |
| 6112071 | Quadrature-free RF receiver for directly receiving angle modulated signal The present invention, generally speaking, provides a quadrature-free RF receiver for directly receiving RF signals such as angle modulated signals. Various embodiments of the receiver use a digital phase detector together with well-known RF components: a... | 08/29/2000 |
| 6112068 | Phase-locked loop circuit with switchable outputs for multiple loop filters An electronic system, such as a wireless telephone handset (10), having multiple voltage-controlled oscillators (26, 28) so that the system can operate in a selected one of multiple frequency bands, is disclosed. Each of the voltage-controlled oscillators... | 08/29/2000 |
| 5493713 | Demodulation of FM audio carrier A method of demodulating an FM carrier wave and a demodulating circuit are described which utilize a gain control circuit. An output is supplied from the gain control circuit to a phase locked loop circuit tuned to a selected carrier wave frequency. A fir... | 02/20/1996 |
| 5448595 | Automatic gain control circuit for a demodulation section of a modem An automatic gain control circuit which is provided in a demodulation section of a modem to adjust the loop gain so that the level of a band-limited receive signal may have a predetermined reference value and to output the receive signal to an automatic e... | 09/05/1995 |
| 5001776 | Communication system with adaptive transceivers to control intermodulation distortion A transceiver determines the signal quality of a desired signal and the strength of all received signals. When the signal quality of the desired signal is low, and the signal strength of all received signals is high, the receiver is adapted to operate in ... | 03/19/1991 |
| 4955077 | Radio with broad band automatic gain control circuit The disclosure relates to a radio which prevents the level of a signal transmitted from a desired broadcasting station from being suppressed by the operation of a broad band automatic gain control circuit in the presence of an interference signal. The rad... | 09/04/1990 |
| 4928314 | Heterodyne stage having precise closed-loop control of the amplitude of the injection signal thereof A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and ... | 05/22/1990 |
| 4541122 | Receiver including FET frequency mixer A receiver including an FET frequency mixer is disclosed. A local oscillator generates a local oscillator signal which is applied to a first amplifier whose gain is varied as a function of a control signal applied thereto. The output of the first amplifie... | 09/10/1985 |
| 4270222 | Radio-frequency head having a self-adaptive dynamic range An HF receiver head having high sensitivity and capable of receiving variable-level input signals has characteristics which are adjusted as a function of the received signal level. The HF head essentially comprises a generator for delivering control volta... | 05/26/1981 |
| 3946318 | Automatic level control circuit for local oscillator signals with the lever control signal being derived from the DC current present in the diode circuit of an MIC frequency mixer The amplitude of a local oscillator signal for use with a frequency mixer is maintained at a given constant level by a control signal derived from the direct current flow through the mixer diodes.... | 03/23/1976 |
