CMOS differential buffer circuit

Details CMOS differential buffer circuit CMOS differential buffer circuit

2005-12-27

2005-12-27

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S292000

Reexamination Certificate

active

06980055

ABSTRACT:
The present invention pertains to a MOS type differential buffer circuit. The buffer proposed herein utilizes capacitive coupling to apply small AC signals to an amplifying current source to mitigate attenuation owing to body effect and output impedance, among other things, in an associated follower component. The proposed circuit does not, however, promote an increase in current and/or power dissipation. Additionally, the circuit allows a desired gain to be achieved while maintaining a relatively constant output impedance, compared to a simple differential source follower.

REFERENCES:
patent: 5850163 (1998-12-01), Drost et al.
patent: 5874840 (1999-02-01), Bonaccio
patent: 6278336 (2001-08-01), Tinsley et al.
patent: 6542031 (2003-04-01), Kwong
patent: 2002/0101285 (2002-08-01), Chatwin
“A 900 MHz CMOS RF Power Amplifier with Programmable Output”, M. Rofougaran, A. Rofougaran, C. Olgaard and A. A. Abidi, 1994 Symposium on VLSI Circuits Digest of Technical Papers, IEEE, Apr. 1994, pp. 133-134.

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