Complementary heterojunction amplifier
AssigneeMotorola, Inc.
InventorsCharles E. Weitzel, Carl Shurboff
Life of this patent
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Abstract
A gallium arsenide amplifier (10) utilizes a P-channel heterojunction transistor (12) and an N-channel heterojunction transistor (11) connected in a stacked configuration. The gate width of the P-channel heterojunction transistor is scaled so that the transconductance of the P-channel heterojunction transistor approximately equals the transconductance of the N-channel heterojunction transistor. The gate length (44) of the N-channel heterojunction transistor is scaled so that the input impedance of the N-channel heterojunction transistor approximately equals the input impedance of the P-channel heterojunction transistor.
Claims12
A complementary heterojunction amplifier comprising:
- a P-channel heterojunction transistor having a first gate width, a first transconductance, and a first input impedance;
- and
- an N-channel heterojunction transistor having a first gate length, a second transconductance, and a second input impedance wherein the first gate width has a value so that the first transconductance and the second transconductance are approximately equal and wherein the first gate length has a value so that the first input impedance is approximately equal to the second input impedance.
A complementary heterojunction gallium arsenide amplifier comprising:
- an N-channel heterojunction gallium arsenide transistor having a first gate width, a first gate length, a first transconductance, and a first input impedance;
- and
- a P-channel heterojunction gallium arsenide transistor having a second gate width, a second gate length, a second transconductance, and a second input impedance wherein the second gate width has a value so that the first transconductance and the second transconductance are approximately equal and wherein the first gate length has a value so that the first input impedance is approximately equal to the second input impedance.
Dependencies are inferred from the claim text.