Power amplifiers with push-pull transistors, capacitive coupling for harmonic cancellation, and inductive coupling to provide differential output signals
First Claim
1. A differential power amplifier comprising:
- a first push-pull pair of transistors includinga first transistor comprising a control terminal and an output terminal, anda second transistor comprising an input terminal and a control terminal, wherein the control terminal of the first transistor and the control terminal of the second transistor are configured to collectively receive a differential input signal, wherein the output terminal of the first transistor and the input terminal of the second transistor are configured to collectively provide a differential output signal;
a first capacitance connected to (i) the output terminal of the first transistor, and (ii) the input terminal of the second transistor, wherein harmonics at the output terminal of the first transistor combine with harmonics at the input terminal of the second transistor via the first capacitance such that the harmonics at the output terminal of the first transistor and the harmonics at the input terminal of the second transistor cancel;
a first inductance, wherein the first transistor and the first inductance are connected in series between a voltage source and a reference terminal;
a second inductance, wherein the second transistor and the second inductance are connected in series between the voltage source and the reference terminal; and
a second capacitance connected in parallel with the first inductance or the second inductance.
3 Assignments
0 Petitions
Accused Products
Abstract
A differential power amplifier including a push-pull pair of transistors, a capacitance, a first inductance, and a second inductance. The push-pull pair of transistors includes first and second transistors. The first transistor includes control and output terminals. The second transistor includes input and control terminals. The control terminals of the first and second transistors collectively receive a differential input signal. The output and input terminals collectively provide a differential output signal. The capacitance is connected to the output and input terminals. The first capacitance cancels first harmonics at the output terminal of the first transistor with second harmonics at the input terminal of the second transistor. The first transistor and the first inductance are connected in series between a voltage source and a reference terminal. The second transistor and the second inductance are connected in series between the voltage source and the reference terminal.
-
Citations
23 Claims
-
1. A differential power amplifier comprising:
-
a first push-pull pair of transistors including a first transistor comprising a control terminal and an output terminal, and a second transistor comprising an input terminal and a control terminal, wherein the control terminal of the first transistor and the control terminal of the second transistor are configured to collectively receive a differential input signal, wherein the output terminal of the first transistor and the input terminal of the second transistor are configured to collectively provide a differential output signal; a first capacitance connected to (i) the output terminal of the first transistor, and (ii) the input terminal of the second transistor, wherein harmonics at the output terminal of the first transistor combine with harmonics at the input terminal of the second transistor via the first capacitance such that the harmonics at the output terminal of the first transistor and the harmonics at the input terminal of the second transistor cancel; a first inductance, wherein the first transistor and the first inductance are connected in series between a voltage source and a reference terminal; a second inductance, wherein the second transistor and the second inductance are connected in series between the voltage source and the reference terminal; and a second capacitance connected in parallel with the first inductance or the second inductance. - View Dependent Claims (2, 3, 21, 22, 23)
-
-
4. A circuit comprising:
-
a differential power amplifier comprising a first push-pull pair of transistors including a first transistor comprising a control terminal and an output terminal, and a second transistor comprising an input terminal and a control terminal, wherein the control terminal of the first transistor and the control terminal of the second transistor are configured to collectively receive a differential input signal, wherein the output terminal of the first transistor and the input terminal of the second transistor are configured to collectively provide a differential output signal, a first capacitance connected to (i) the output terminal of the first transistor, and (ii) the input terminal of the second transistor, wherein harmonics at the output terminal of the first transistor combine with harmonics at the input terminal of the second transistor via the first capacitance such that the harmonics at the output terminal of the first transistor and the harmonics at the input terminal of the second transistor cancel, a first inductance, wherein the first transistor and the first inductance are connected in series between a voltage source and a reference terminal, and a second inductance, wherein the second transistor and the second inductance are connected in series between the voltage source and the reference terminal, and a second power amplifier comprising a differential input configured to receive the differential output signal, and a differential output configured to output a second differential output signal. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A power amplifier comprising:
-
a first differential amplifier comprising a differential input, a first output terminal and a second output terminal, wherein the differential input is configured to receive a differential input signal, and wherein the first output terminal and the second output terminal are configured to collectively output a first differential output; a first inductance; a second inductance, wherein the first inductance and the second inductance are connected in series between the first output terminal and the second output terminal of the first differential amplifier, and wherein the first inductance and the second inductance are connected to each other at a voltage source terminal or a ground reference terminal; a third inductance inductively coupled to the first inductance; a fourth inductance inductively coupled to the second inductance, wherein the third inductance and the fourth inductance provide a second differential output; a second differential amplifier comprising a third output terminal and a fourth output terminal, wherein the third output terminal and the fourth output terminal are not connected to the first output terminal and the second output terminal; a first capacitance connected between the first output terminal and the second third output terminal, wherein harmonics at the first output terminal combine with harmonics at the third output terminal such that the harmonics at the first output terminal and the harmonics at the third output terminal cancel out each other; and a second capacitance connected between the second output terminal and the fourth output terminal, wherein harmonics at the second output terminal combine with harmonics at the fourth output terminal such that the harmonics at the second output terminal and the harmonics at the fourth output terminal cancel. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
Specification