Very high gain positive feedback CMOS transconductance amplifier
AssigneeMicro Linear Corporation
InventorsCarlos A. Laber, Paul R. Gray
Life of this patent
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Abstract
This invention is for a transconductance amplifier. The amplifier has an amplifier input and an amplifier output with an amplifier output impedance. An input stage of the amplifier has a first transconductance. An intermediate state is coupled to the amplifier output through positive feedback. The intermediate stage has a second transconductance and an intermediate stage output having an intermediate output impedance. The gain of the amplifier is a function of the first transconductance times the second transconductance times the amplifier output impedance times the intermediate output impedance.
Claims9
A transconductance amplifier with a gain having an amplifier input, an amplifier output and an amplifier output impedance, said amplifier comprising:
- a. a first amplification means coupled to said amplifier input and having a first transconductance;
- and
- b. a second amplification means having a second amplifier input, a second transconductance and a second output with a second output impedance;
- and
- c. positive feedback means for coupling the output of said amplifier to the second amplifier input of said second amplification means,
- wherein the gain of the amplifier is a function of the first transconductance times the second transconductance times the amplifier output impedance times the second output impedance.
A CMOS transconductance type amplifier of the type having a differential input stage having a first transconductance and an amplifier output having an amplifier output impedance wherein the improvement comprises:
- a. a second amplifier stage having a second input, a second transconductance and a second output with a second output impedance;
- and
- b. a positive feedback path coupling the amplifier output to the second input,
- whereby the gain of the transconductance amplifier is proportional to the first transconductance times the second transconductance times the amplifier output impedance times the second output impedance.
Dependencies are inferred from the claim text.