Circuit and method of amplifying a signal for a receiver

Details Circuit and method of amplifying a signal for a receiver Circuit and method of amplifying a signal for a receiver

1998-07-27

2000-10-17

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330310, H03F 3191

Patent

active

061337935

ABSTRACT:
A transceiver (10) has a transmitter (12) and an image reject receiver (16). The image reject receiver (16) provides frequency translation of two modulated signals received from an antenna (14). The image reject receiver (16) has two mixers (22 and 32) to accomplish the frequency translation. One mixer (22) receives a modulated signal for GSM operation and the other mixer (32) receives a modulated signal for DCS/PCS operation. A local oscillator (24) generates another signal having a gain controlled by an amplifier (26) for supplying differential signals to both of the mixers (22 and 32). The amplifier (26) uses transistors (46 and 58) with inductors (40, 52, and 68) to generate the differential signals.

REFERENCES:
patent: 4893035 (1990-01-01), Reynolds et al.
patent: 5339048 (1994-08-01), Weber
patent: 5825231 (1998-10-01), Chevallier et al.
patent: 5945878 (1999-08-01), Westwick et al.
patent: 5945879 (1999-08-01), Rodwell et al.

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