Variable gain amplifier for low voltage applications

Details Variable gain amplifier for low voltage applications Variable gain amplifier for low voltage applications

2006-05-12

2010-12-07

Vuong, Quochien B (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S127200, C455S232100, C330S254000, C330S278000

Reexamination Certificate

active

07848724

ABSTRACT:
An integrated communications system. Comprising a substrate having a receiver disposed on the substrate for converting a received signal to an IF signal. Coupled to a VGA for low voltage applications and coupled to the receiver for processing the IF signal. The VGA includes a bank pair having a first bank of differential pairs of transistors and a second bank of differential pairs of transistors. The bank pair is cross-coupled in parallel, the IF signal is applied to the bank pair decoupled from a control signal used to control transconductance output gain of the bank pair over a range of input voltages. A digital IF demodulator is disposed on the substrate and coupled to the VGA for low voltage applications, for converting the IF signal to a demodulated baseband signal. And a transmitter is disposed on the substrate operating in cooperation with the receiver to establish a two way communications path.

REFERENCES:
patent: 3641450 (1972-02-01), Lunn
patent: 4211975 (1980-07-01), Kuroda
patent: 4357578 (1982-11-01), Yokoyama
patent: 5077541 (1991-12-01), Gilbert
patent: 5469106 (1995-11-01), Dow
patent: 5581213 (1996-12-01), Linder et al.
patent: 5625307 (1997-04-01), Scheinerg
patent: 5668502 (1997-09-01), Rijns
patent: 5715012 (1998-02-01), Patel et al.
patent: 5737035 (1998-04-01), Rotzoll
patent: 5742203 (1998-04-01), Van De Plassche et al.
patent: 5828265 (1998-10-01), Mensink et al.
patent: 5896063 (1999-04-01), Marsh
patent: 5949285 (1999-09-01), Ando
patent: 5949286 (1999-09-01), Jones
patent: 5990740 (1999-11-01), Groe
patent: 6049251 (2000-04-01), Meyer
patent: 6150881 (2000-11-01), Lovelace et al.
patent: 6188281 (2001-02-01), Smith et al.
patent: 6373337 (2002-04-01), Ganser
patent: 6445251 (2002-09-01), Robinson
patent: 6684065 (2004-01-01), Bult et al.
patent: 6894564 (2005-05-01), Gilbert
patent: 7076226 (2006-07-01), Bult et al.
patent: 0 587 965 (1994-03-01), None
Gilbert, B., “A Low-Noise Wideband Variable-Gain Amplifier Using an Interpolated Ladder Attenuator,” IEEE International Solid-State Circuits Conference, US, New York, No. 34, Feb. 1991, pp. 280-281 and p. 330.
Leung, L., et al., “10-MHz 60-dB Dynamic-Range 6-dB Variable Gain Amplifier,” IEEE, 1997, pp. 173-176.
Poole, S. et al., “A CMOS Subscriber Line Audio Processing Circuit Including Adaptive Balance,” IEEE International Symposium on Circuits and Systems, Finland, Espoo, vol. 2 of 3, Jun. 7-9, 1988, pp. 1931-1934.
Furth et al., “Linearised Differential Transductors in Subthreshold CMOS”, Electronics Letters, IEEE Stevenage, GB, vol. 31, No. 7, Mar. 30, 1995, pp. 545-547.
International Search Report for International Application No. PCT/US01/04451, filed Feb. 8, 2001.
Mensink et al., “A CMOS “Soft-Switched” Transconductor and Its Application in Gain Control and Filters”, IEEE Journal of Solid-State Circuits, vol. 32, No. 7, Jul. 1997.
Shin et al., “An Inductorless 900MHz RF Low-Noise Amplifier in 0.9um CMOS”, IEEE 1997 Custom Integrated Circuits Conference, May 5-8, 1997, pp. 513-516.
Tham et al., “A Direct-Conversion Transceiver Chip Set for 900MHz (ISM BAND) Spread-Spectrum Digital Cordless Telephone”, 1996 IEEE International Symposium on Circuits and Systems, vol. 4, May 12-15, 1996, pp. 85-88.

Affiliated with

Also associated with

Rating

Variable gain amplifier for low voltage applications does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable gain amplifier for low voltage applications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable gain amplifier for low voltage applications will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4156579