Linear source follower amplifier
AssigneeApplied Micro Circuits Corporation
InventorsTarun Gupta, Ramesh Kumar Singh
Life of this patent
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Abstract
A linear source follower amplifier is provided with a first metal-oxide semiconductor (MOS) field effect transistor (FET) having a gate to accept an ac input signal and a source to supply an ac output signal. A second MOS FET has a gate to accept the ac input signal, a source connected to the drain of the first MOS FET. A third MOS FET has a drain connected to the source of the first MOS FET, a gate connected to the drain of the second MOS FET, and a source connected to a first reference voltage. A fourth MOS FET has a drain and a gate connected to the drain of the second MOS FET and a source connected to the first reference voltage. A current source has an input connected to a second reference voltage, and an output connected to the drain of the first MOS FET.
Claims17
A linear source follower amplifier comprising:
- a first metal-oxide semiconductor (MOS) field effect transistor (FET) selected from a group consisting of NMOS and PMOS, having a gate to accept an ac input signal, a drain, and a source to supply an ac output signal;
- a second MOS FET selected from the group having a gate to accept the ac input signal, a source connected to the drain the first MOS FET, and a drain;
- a third MOS FET selected from the group, having a drain connected to the source of the first MOS FET, a gate connected to the drain of the second MOS FET, and a source connected to a first reference voltage;
- a fourth MOS FET selected from the group, having a drain and a gate connected to the drain of the second MOS FET, and a source connected to the first reference voltage;
- and,
- a current source having an input connected to a second reference voltage, and an output connected to the drain of the first MOS FET.
A linear emitter follower amplifier comprising:
- a first n-p-n transistor having a base to accept an ac input signal, a collector, and an emitter to supply an ac output signal;
- a first p-n-p transistor having a base to accept an ac input signal, an emitter connected to the collector the first n-p-n transistor, and a collector;
- a second n-p-n transistor having a collector connected to the emitter of the first n-p-n transistor, a base connected to the collector of the first p-n-p transistor, and an emitter connected to a first reference voltage;
- a third n-p-n transistor having a collector and base connected to the collector of the first p-n-p transistor, and an emitter connected to the first reference voltage;
- and,
- a current source having an input connected to a second reference voltage having a higher voltage potential than the first reference voltage, and an output connected to the collector of the first n-p-n transistor.
A linear emitter follower amplifier comprising:
- a first p-n-p transistor having a base to accept an ac input signal, a collector, and an emitter to supply an ac output signal;
- a first n-p-n transistor having a base to accept an ac input signal, an emitter connected to the collector the first p-n-p transistor, and a collector;
- a second p-n-p transistor having a collector connected to the emitter of the first p-n-p transistor, a base connected to the collector of the first n-p-n transistor, and an emitter connected to a first reference voltage;
- a third p-n-p transistor having a collector and base connected to the collector of the first n-p-n transistor, and an emitter connected to the first reference voltage;
- and,
- a current source having an output connected to a second reference voltage having a lower voltage potential than the first reference voltage, and an input connected to the collector of the first p-n-p transistor.
Dependencies are inferred from the claim text.