Constant impedance in CMOS input and output gain stages for...

Details Constant impedance in CMOS input and output gain stages for... Constant impedance in CMOS input and output gain stages for...

2005-03-15

2005-03-15

Smith, Creighton (Department: 2645)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C330S254000, C330S278000

Reexamination Certificate

active

06868262

ABSTRACT:
An apparatus to provide a stage in a transmitter or receiver operating in wireless frequency ranges performing a gain control function between a final or an initial stage respectively and process circuitry for adjusting gain and providing a constant input impedance at its input and a constant output impedance at its output, providing a direct conversion transceiver in which constant impedance gain control circuits are provided in the receive and transmit paths, all of which are simple in construction and efficient in operation.

REFERENCES:
patent: 3886380 (1975-05-01), Sobajima et al.
patent: 4495648 (1985-01-01), Giger
patent: 4602215 (1986-07-01), Ryaboshtan et al.
patent: 6069526 (2000-05-01), Ballantyne
patent: 6215989 (2001-04-01), Otaka
patent: 6721368 (2004-04-01), Younis et al.
patent: 6744317 (2004-06-01), Kim et al.

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