Constant transconductance bias circuit and method

Details Constant transconductance bias circuit and method Constant transconductance bias circuit and method

1993-08-25

1995-01-24

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

053845480

ABSTRACT:
The reduction of the power supply voltage of VLSI circuits to 3.3 volts results in a significant loss in input and output swing in traditional CMOS analog circuits. In order to achieve rail-to-rail operation, n-channel and p-channel MOSFETs are placed in parallel so that at least one type of transistors are operating in a high gain region throughout the entire input range. However, circuit characteristics change as transistors turn on and off. A constant transconductance bias means enables the rail-to-rail CMOS differential stage to possess a constant transconductance over the entire common mode voltage range. Significantly, the bias circuit does not require any matching between the transistors of opposite types.

REFERENCES:
patent: 5142244 (1992-08-01), Glica et al.
CMOS Low-Voltage Operational Amplifiers with Constant-G.sub.M Rail-to-Rail Input Stage; IEEE, 1992, pp. 2876-2879.

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