Class B FET amplifier circuit
First Claim
1. An FET circuit comprising an amplifier stage and a waveform shaping stage;
- said amplifier stage including a first p-channel FET and a first n-channel FET, means for biasing the gate of each of said FETs at a dc level nearly equal to its drain potential, (means for setting the potential differential between the source and the drain of each of said FETS at a voltage nearly equal to its threshold voltage;
) and means for supplying a linear input signal to said gates through respective capacitors; and
said waveform shaping stage comprising means for converting a linear signal into a digital signal including a second p-channel FET having a gate coupled to the drain of said first p-channel FET, and a second n-channel FET having a gate coupled to the drain of said first n-channel FET.
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Abstract
A complementary inverter amplifier circuit comprising a complementary inverter including a p-channel MIS FET connected to a first source potential, an n-channel MIS FET connected to a second source potential, the gate of the two FETs being applied with a common linear input, respective load resistors connected to the drains of the complementary FETs, an output being derived from the interconnection point of the load resistors or from the drains of the FETs, and a bias resistor connected between the gate and the drain of each of the complementary FETs, the input being supplied to the gates of the FETs through respective capacitors. The p-channel FET and n-channel FET are individually biased so that the circuit may serve as a class B push pull amplifier of low power consumption.
29 Citations
15 Claims
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1. An FET circuit comprising an amplifier stage and a waveform shaping stage;
- said amplifier stage including a first p-channel FET and a first n-channel FET, means for biasing the gate of each of said FETs at a dc level nearly equal to its drain potential, (means for setting the potential differential between the source and the drain of each of said FETS at a voltage nearly equal to its threshold voltage;
) and means for supplying a linear input signal to said gates through respective capacitors; and
said waveform shaping stage comprising means for converting a linear signal into a digital signal including a second p-channel FET having a gate coupled to the drain of said first p-channel FET, and a second n-channel FET having a gate coupled to the drain of said first n-channel FET.
- said amplifier stage including a first p-channel FET and a first n-channel FET, means for biasing the gate of each of said FETs at a dc level nearly equal to its drain potential, (means for setting the potential differential between the source and the drain of each of said FETS at a voltage nearly equal to its threshold voltage;
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2. An amplifier circuit comprising a complementary inverter including a first FET of a first conductivity type connected to a first source potential, a second FET of a second conductivity type connected to a second source potential, and an input terminal connected to the gates of said first and second FETs, the circuit comprising:
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a series connection of first and second load resistors connected between said first and second FETs; a respective bias resistor connected between the gate and the drain of each of said first and second FETs; a respective capacitor connected between the input terminal and the gate of each of said FETs; and output means connected to the drains of said FETs. - View Dependent Claims (3, 4)
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5. An amplifier circuit comprising, in combination,
first and second operating voltage terminals of different potential level; -
first and second field effect transistors (FET) of complementary conductivity type, each having a source, a gate and a drain, the sources of said complementary FETs being connected to said first and second operating voltage terminals respectively, the gates of said complementary FETs being ac-coupled to an input terminal; and a resistor connected between the drains of said complementary FETs, the connection between said resistor and said complementary FETs serving as an output terminal. - View Dependent Claims (6, 7)
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8. A complementary push-pull amplifier comprising:
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a p-channel FET having a source coupled to a positive power source terminal, a gate and a drain; an n-channel FET having a source coupled to a negative power source terminal, a gate and a drain; resistive means coupled between said drains of said FETs and; means for applying an a.c. input signal to said gates of said FETs to operate said FETs in a push-pull mode. - View Dependent Claims (9, 10)
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- 11. A complementary push-pull comprising a p-channel FET, an n-channel FET, resistive load means connected to at least one of said FETs, a resistive bias means coupled between the gate and drain of said one FET for applying a bias voltage substantially equal to the drain d.c. potential of said FET to said gate thereof, means for connecting said FETs and said resistive load means so that said resistive load means and the conduction paths between the sources and the drains of the respective FETs are connected in series and, means for applying an a.c. input signal to the gates of said FETs, the resistance of said load means being higher than the on-resistance of said one FET and the potential differential between the source and gate of said one FET approaching its threshold voltage.
- 14. A complementary FET circuit comprising an amplifier stage and a succeeding state, each being comprised of complementary FETs, said amplifier stage including means for producing two output signals having d.c. potentials different from each other in response to an input signal, said succeeding stage having two input terminals for receiving said two output signals.
Specification