Mixer circuits and methods with improved spectral purity
AssigneeWiLinx, Inc.
InventorsRahim Bagheri, Masoud Djafari
Life of this patent
Estimating the term…
Abstract
Embodiments of the present invention include mixer circuits and methods with improved spectral purity. In one embodiment the present invention includes a mixer circuit comprising a first transistor having a gate, a source and a drain, a second transistor having a gate, a source and a drain, a first capacitance coupled between the source of the first transistor and the source of the second transistor and a bias circuit having an input, a first output coupled to the source of the first transistor and a second output coupled to the source of the second transistor. The present invention may be advantageously used in a wireless transmitter application.
Claims21
A mixer circuit comprising:
- a first transistor having a gate, a source and a drain;
- a second transistor having a gate, a source and a drain;
- a first capacitance coupled between the source of the first transistor and the source of the second transistor;
- and
- a bias circuit having an input, a first output coupled to the source of the first transistor and a second output coupled to the source of the second transistor.
A mixer circuit comprising:
- a first transistor having a gate, a source and a drain;
- a second transistor having a gate, a source and a drain;
- a third transistor having a gate, a source and a drain;
- a fourth transistor having a gate, a source and a drain;
- a first capacitance coupled between the source of the first transistor and the source of the second transistor;
- a second capacitance coupled between the source of the third transistor and the source of the fourth transistor;
- and
- a bias circuit having first and second inputs, a first output coupled to the source of the first transistor, a second output coupled to the source of the second transistor, a third output coupled to the source of the third transistor and a fourth output coupled to the source of the fourth transistor.
A mixer circuit comprising:
- a first transistor having a gate, a source and a drain;
- a second transistor having a gate, a source and a drain;
- a first capacitor coupled between the source of the first transistor and the source of the second transistor;
- a first resistor having a first terminal coupled to the source of the first transistor and a second terminal coupled to a first reference voltage;
- a second resistor having a first terminal coupled to the source of the second transistor and a second terminal coupled to the first reference voltage;
- a second capacitor having a first terminal coupled to the source of the first transistor;
- and
- a third capacitor having a first terminal coupled to the source of the second transistor.
Dependencies are inferred from the claim text.