# US 8,543,078 B2 · Harmonic mixer circuit

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- Number: US 8,543,078 B2
- Document ID: US8543078B2
- Status: Granted
- Kind: B2
- Application number: 13/076,871
- Filed: 2011-03-31
- Published: 2011-10-06
- Granted: 2013-09-24
- Earliest claimed: 2010-04-01
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Osamu Anegawa; Osamu Baba; Miki Kubota; Tsuneo Tokumitsu
- Inventors: Osamu Anegawa; Osamu Baba; Miki Kubota; Tsuneo Tokumitsu
- Web page: https://patentgrep.com/patent/US8543078B2

## CPC

- H03D 7/1441: {using field-effect transistors (H03D7/145 takes precedence)}
- H03D 7/1433: {using bipolar transistors (H03D7/145 takes precedence)}
- H03D 7/1466: {Passive mixer arrangements}
- H03D 7/1475: {Subharmonic mixer arrangements}
- H03D 7/1483: {comprising components for selecting a particular frequency component of the output}
- H03C 2200/0033: Transmission lines, e.g. striplines, microstrips or coplanar lines
- H03D 2200/0023: Balun circuits
- H03D: DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K9/00; transforming types of pulse modulation H03K11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B7/14; demodulators adapted for AC systems of digital information transmission H04L27/00; synchronous demodulators adapted for colour television H04N9/66)
- H03C: MODULATION (masers or lasers H01S; coding, decoding or code conversion H03M)

## Abstract

A circuit includes: a first line to which input and output signal terminals are connected; a first transistor having a first terminal connected to the first line, a second terminal connected to a ground potential, and a control terminal supplied with a first oscillation signal, the first transistor outputting the first signal and its harmonic component; a second transistor having a first terminal connected to the first line, a second terminal connected to the ground potential, and a control terminal supplied with a second oscillation signal, the second transistor outputting the second signal and its harmonic component; a first harmonic generator connected to the control terminal of the first transistor and generates a harmonic component including the harmonic component by the first transistor; and a second harmonic generator connected to the control terminal of the second transistor and generates a harmonic component including the harmonic component by the second transistor.

## Claims

### Claim 1

An electronic circuit comprising:
a first transmission line to which an input signal terminal and an output signal terminal are connected;
a first transistor having a first terminal connected to the first transmission line, a second terminal connected to a ground potential, and a control terminal supplied with a first oscillation signal, the first transistor outputting the first oscillation signal and a harmonic component thereof;
a second transistor having a first terminal connected to the first transmission line, a second terminal connected to the ground potential, and a control terminal supplied with a second oscillation signal, the second transistor outputting the second oscillation signal and a harmonic component thereof;
a first harmonic generation part connected to the control terminal of the first transistor and generates a harmonic component including the harmonic component generated by the first transistor; and
a second harmonic generation part connected to the control terminal of the second transistor and generates a harmonic component including the harmonic component generated by the second transistor,
wherein the harmonic component generated by the first harmonic generation part has a phase that cancels the harmonic component generated by the first transistor, and the harmonic component generated by the second harmonic generation part has a phase that cancels the harmonic component generated by the second transistor.

### Claim 2 (depends on 1)

The electronic circuit according to claim 1, wherein:
the first harmonic generation circuit includes a third transistor having a first terminal connected to the control terminal of the first transistor, a second terminal connected to the ground potential and a control terminal supplied with the first oscillation signal; and
the second harmonic generation circuit includes a fourth transistor having a first terminal connected to the control terminal of the second transistor, a second terminal connected to the ground potential and a control terminal supplied with the second oscillation signal.

### Claim 3 (depends on 2)

The electronic circuit according to claim 2, wherein the first and second transistors have an identical characteristic, and the third and fourth transistors have an identical characteristic.

### Claim 4 (depends on 2)

The electronic circuit according to claim 2, further comprising:
a second transmission line connected between the control terminal of the third transistor and the first terminal of the third transistor; and
a third transmission line connected between the control terminal of the fourth transistor and the first terminal of the fourth transistor,
the first oscillation signal being applied to the control terminal of the first transistor via the second transmission line,
the second oscillation signal being applied to the control terminal of the second transistor via the second transmission line.

### Claim 5 (depends on 4)

The electronic circuit according to claim 4, further comprising:
a first condenser connected between a node between the second transmission line and the control terminal of the first transistor and the first terminal of the third transistor; and
a second condenser connected between a node between the third transmission line and the control terminal of the second transistor and the first terminal of the fourth transistor.

### Claim 6 (depends on 1)

The electronic circuit according to claim 1, wherein the first oscillation signal and the second oscillation signal are inverted.

### Claim 7 (depends on 6)

The electronic circuit according to claim 6, wherein the first oscillation signal and the second oscillation signal are generated from a common local signal.

### Claim 8 (depends on 7)

The electronic circuit according to claim 7, further comprising:
a 180° coupler having an input terminal, a first terminal and a second terminal, the input terminal receives the common local signal, the first output terminal outputs the first oscillation signal, and the second output terminal outputs the second oscillation signal.

### Claim 9 (depends on 8)

The electronic circuit according to claim 8, wherein the 180° coupler comprised of a balun circuit.

### Claim 10 (depends on 6)

The electronic circuit according to claim 6, wherein an IF signal is inputted into the input terminal connected with the first transmission line.

### Claim 11 (depends on 10)

The electronic circuit according to claim 10, wherein an RF signal is outputted from the output terminal connected with the transmission line.