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US 2016/0079922 A1Published application
Mixer circuit
AssigneeNational Chi Nan University
InventorsYo-Sheng LIN, Guo-Hao LI
Life of this patent
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Abstract
A mixer circuit includes a single-ended to differential converter, first and second transistors, first to fourth inductive transmission lines, and a mixer. The first and second transistors receive a differential input voltage signal pair from the single-ended to differential converter and generate a differential input current signal pair. The mixer mixes the differential input current signal pair with a differential oscillatory voltage signal pair. The first and second inductive transmission lines are configured such that an equivalent input impedance seen into the first and second transistors matches an equivalent output impedance seen into the first single-ended to differential converter.
Claims13
A mixer circuit comprising:
- a first single-ended to differential converter having an input terminal adapted for receiving an input voltage signal, a first output terminal and a second output terminal, said first single-ended to differential converter converting the input voltage signal into a differential input voltage signal pair that includes a first voltage signal and a second voltage signal, and outputting the first and second voltage signals respectively at said first and second output terminals;
- a first transistor having a first terminal for providing a first current signal, a second terminal, and a control terminal coupled to said first output terminal of said first single-ended to differential converter for receiving the first voltage signal therefrom;
- a second transistor having a first terminal for providing a second current signal, a second terminal, and a control terminal coupled to said second output terminal of said first single-ended to differential converter for receiving the second voltage signal therefrom, the first and second current signals cooperatively constituting a differential input current signal pair;
- a first inductive transmission line having a first terminal coupled to said second terminal of said first transistor, and a second terminal;
- a second inductive transmission line having a first terminal coupled to said second terminal of said first inductive transmission line, and a second terminal coupled to said second terminal of said second transistor;
- a third inductive transmission line having a first terminal, and a second terminal coupled to said first terminal of said first transistor;
- a fourth inductive transmission line having a first terminal, and a second terminal coupled to said first terminal of said second transistor;
- and
- a mixer receiving a differential oscillatory voltage signal pair, and coupled to said first terminals of said third and fourth inductive transmission lines for receiving the differential input current signal pair through said third and fourth inductive transmission lines, said mixer mixing the differential input current signal pair with the differential oscillatory voltage signal pair to obtain a differential mixed voltage signal pair;
- wherein said first and second inductive transmission lines are configured such that an equivalent input impedance seen into said first and second transistors from said control terminals thereof matches an equivalent output impedance seen into said first single-ended to differential converter from said first and second output terminals thereof.
7 more elements
A mixer circuit comprising:
- a first transistor and a second transistor each having a first terminal, a second terminal and a control terminal, said control terminals of said first and second transistors being disposed to receive a differential input voltage signal pair, said first terminals of said first and second transistors cooperatively providing a differential input current signal pair;
- a first inductive transmission line and a second inductive transmission line each having a first terminal, and a second terminal coupled to a respective one of said first terminals of said first and second transistors;
- and
- a mixer disposed to receive a differential oscillatory voltage signal pair, coupled to said first terminals of said first and second inductive transmission lines for receiving the differential input current signal pair therethrough, and configured to mix the differential input current signal pair with the differential oscillatory voltage signal pair;
- wherein said first and second inductive transmission lines are configured to compensate a frequency pole resulting from parasitic capacitances of said mixer, said first transistor and said second transistor.
2 more elements
A mixer circuit comprising:
- a single-ended to differential converter adapted for receiving an input voltage signal, and converting the input voltage signal into a differential input voltage signal pair;
- a first transistor and a second transistor each having a first terminal, a second terminal and a control terminal, said control terminals of said first and second transistors being coupled to said single-ended to differential converter to cooperatively receive the differential input voltage signal pair therefrom, said first terminals of said first and second transistors cooperatively providing a differential input current signal pair;
- a first inductive transmission line having a first terminal coupled to said second terminal of said first transistor, and a second terminal;
- a second inductive transmission line having a first terminal coupled to said second terminal of said first inductive transmission line, and a second terminal coupled to said second terminal of said second transistor;
- and
- a mixer disposed to receive a differential oscillatory voltage signal pair, coupled to said first terminals of said first and second transistors for receiving the differential input current signal pair therefrom, and configured to mix the differential input current signal pair with the differential oscillatory voltage signal pair;
- wherein said first and second inductive transmission lines are configured such that an equivalent input impedance seen into said first and second transistors from said control terminals thereof matches an equivalent output impedance of said single-ended to differential converter.
4 more elements
Dependencies are inferred from the claim text.