Radio frequency transceiver and subassemblies thereof

Details Radio frequency transceiver and subassemblies thereof Radio frequency transceiver and subassemblies thereof

1997-03-24

1999-12-14

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

4552341, 375316, 375345, H04B 126

Patent

active

060029250

ABSTRACT:
A transceiver having a transmitter section and a receiver section. The transmitter section includes a modulator to superimpose information, i.e., data, onto the amplitude of a suitable carrier signal, such as a microwave frequency carrier signal. The receiver section receives data carried by the carrier frequency signal and, in a heterodyning system, downconverts the received signal to a suitable intermediate frequency signal. The modulator and the downconverter are formed on a single semiconductor body, or chip of silicon. The receiver section is adapted to receive signals over a predetermined overall bandwith having frequencies within a plurality of frequency channels, each one of the channels having a predetermined channel bandwidth; and, a sampler for sampling such received signals at a sampling frequency less twice the predetermined bandwidth. The sampling frequency is selected to convert the carrier frequency of a signal within a selected one of the frequency channels to a frequency within a predetermined intermediate frequency and to convert the carrier frequencies of signals of the un-selected one of the frequency channels to frequencies above other than the predetermined intermediate frequency. The downconverted signals are converted into corresponding digital signals. A demodulator includes a Hilbert-Transform-pair filter section. The receiver includes: a first automatic gain control circuit (AGC) and is responsive to an output of the digital signal processor, for adjusting the gain of the AGC circuit in accordance with the output of the digital signal processor; and, a second AGC circuit fed by the digital signals and the output of the digital signal processor, for adjusting the gain of the magnitude of the digital signals in accordance with the output of the digital signal processor.

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patent: 5793801 (1998-08-01), Fertner
IEEE Journal of Solid-State Circuits, vol. 25, No. 1., Feb. 1990, pp. 312-315 "A 300-MHz CMOS Voltage Controlled Ring Oscillator" by S.K. Enam and Asad A. Abidi..

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