Differential amplifier circuit with almost linear transconductan

Details Differential amplifier circuit with almost linear transconductan Differential amplifier circuit with almost linear transconductan

1993-12-08

1996-03-19

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, H03F 345

Patent

active

055006230

ABSTRACT:
A differential amplifier circuit having an improved transconductance linearity, which includes a first to fourth unbalanced differential pairs of MOS transistors. In each differential pair, a ratio (W/L) of a gate-width W and a gate-length L of one transistor is different from that of the other transistor. Gates of the transistors having smaller ratios of the first and third pairs and gates of the transistors having larger ratios of the second and fourth pairs are coupled together to form one of differential input ends. Gates of the transistors having larger ratios of the first and third pairs and gates of the transistors having smaller ratios of the second and fourth pairs are coupled together to form the other of the input ends. Drains of the transistors having smaller ratios of the first and second pairs and drains of the transistors having larger ratios of the third and fourth pairs are coupled together to form one of differential output ends. Drains of the transistors having larger ratios of the first and second pairs and drains of the transistors having smaller ratios of the third and fourth pairs are coupled together to form the other of the output ends.

REFERENCES:
patent: 4965528 (1990-10-01), Okanobu
P. Wu et al., "A CMOS OTA with Improved Linearity Based on Current Addition", IEEE International Symposium on Circuits and Systems, May 1990, pp. 2297-2299.
G. A. De Veirman et al., "Design of a Bipolar 10-MHz Programmable . . . Linear Phase Filter", IEEE Journal of Solid-State Circuits, vol. 27, No. 3, Mar. 1992, pp. 324-331.
Z. Czarnul et al., "Highly-Linear Transconductor Cell Realised by Double MOS Transistor . . . Pairs", Electronics Letters, vol. 26, No. 21, Oct. 11, 1990, pp. 1819-1821.
G. Wilson et al., "Comparison of four CMOS transconductors for fully integrated . . . applications", IEE Proceedings-G, vol. 138, No. 6, Dec. 1991, pp. 683-688.
A. Nedungadi et al., "Design of Linear CMOS Transconductance Elements", IEEE Transactions on Circuits and Systems, vol. CAS-31, No. 10, Oct. 1984, pp. 891-894.
Koyama, M. et al, "A 10/7 MHz Continuous-Time Bandpass Filter Bipolar IC", IEEE 1989 Custom Integrated Circuits Conference, 1989, pp. 25.2.2-25.2.4.
A. Nedungadi et al, "Design of Linear CMOS Transconductance Elements", IEEE Transactions on Circuits and Systems, vol. CAS-31, No. 10, Oct. 1984, pp. 891-894.

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