High-linearity complementary amplifier
First Claim
1. An apparatus comprising:
- an N-channel metal oxide semiconductor (NMOS) transistor configured to receive and amplify an input signal; and
a P-channel metal oxide semiconductor (PMOS) transistor coupled to the NMOS transistor and configured to receive and amplify the input signal, the NMOS and PMOS transistors operating as a linear complementary amplifier and providing an output signal, the NMOS and PMOS transistors having dimensions selected to keep a total transconductance for the NMOS and PMOS transistors approximately constant over a range of the input signal.
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Accused Products
Abstract
A complementary amplifier includes an NMOS transistor coupled to a PMOS transistor in a stacked configuration. The NMOS transistor and the PMOS transistor receive and amplify an input signal. The NMOS and PMOS transistors operate as a linear complementary amplifier and provide an output signal. The NMOS and PMOS transistors may have separate bias voltages, which may be selected to overlap the low-to-high and high-to-low transitions of the transconductances of these transistors. The width and length dimensions of the NMOS and PMOS transistors may be selected to match the change in input capacitance and the change in transconductance of the NMOS transistor in moderate inversion region with the change in input capacitance and the change in transconductance of the PMOS transistor in moderate inversion region. The complementary amplifier may have an approximately constant total input capacitance and an approximately constant total transconductance over a range of voltages.
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Citations
25 Claims
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1. An apparatus comprising:
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an N-channel metal oxide semiconductor (NMOS) transistor configured to receive and amplify an input signal; and a P-channel metal oxide semiconductor (PMOS) transistor coupled to the NMOS transistor and configured to receive and amplify the input signal, the NMOS and PMOS transistors operating as a linear complementary amplifier and providing an output signal, the NMOS and PMOS transistors having dimensions selected to keep a total transconductance for the NMOS and PMOS transistors approximately constant over a range of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An integrated circuit comprising:
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an N-channel metal oxide semiconductor (NMOS) transistor configured to receive and amplify an input signal; and a P-channel metal oxide semiconductor (PMOS) transistor coupled to the NMOS transistor and configured to receive and amplify the input signal, the NMOS and PMOS transistors operating as a linear complementary amplifier and providing an output signal, the NMOS and PMOS transistors having dimensions selected to keep a total transconductance for the NMOS and PMOS transistors approximately constant over a range of the input signal. - View Dependent Claims (15, 16, 17)
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18. An integrated circuit comprising:
a low noise amplifier (LNA) including an N-channel metal oxide semiconductor (NMOS) transistor configured to receive and amplify a radio frequency (RF) input signal; and a P-channel metal oxide semiconductor (PMOS) transistor coupled to the NMOS transistor and configured to receive and amplify the RF input signal, the NMOS and PMOS transistors operating as a linear complementary amplifier and providing an RF output signal, the NMOS and PMOS transistors having dimensions selected to keep a total transconductance for the NMOS and PMOS transistors approximately constant over a range of the input signal. - View Dependent Claims (19)
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20. A method comprising:
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amplifying an input signal with an N-channel metal oxide semiconductor (NMOS) transistor having a first transconductance; amplifying the input signal with a P-channel metal oxide semiconductor (PMOS) transistor having a second transconductance and coupled to the NMOS transistor; and providing an output signal at drains of the NMOS and PMOS transistors operating as a linear complementary amplifier, the NMOS and PMOS transistors having dimensions selected to keep a total transconductance for the NMOS and PMOS transistors approximately constant over a range of the input signal. - View Dependent Claims (21, 22)
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23. An apparatus comprising:
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means for amplifying an input signal with an N-channel metal oxide semiconductor (NMOS) transistor having a first transconductance; means for amplifying the input signal with a P-channel metal oxide semiconductor (PMOS) transistor having a second transconductance and coupled to the NMOS transistor; and means for providing an output signal at drains of the NMOS and PMOS transistors operating as a linear complementary amplifier, the NMOS and PMOS transistors having dimensions selected to keep a total transconductance for the NMOS and PMOS transistors approximately constant over a range of the input signal. - View Dependent Claims (24, 25)
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Specification