Back to results
US 7,548,136 B1Granted
Distortion reduction for variable capacitance devices
AssigneeRF Magic, Inc.
InventorPeter Jivan Shah
Life of this patent
Estimating the term…
Abstract
The present invention reduces distortion in variable capacitance devices by connecting a circuit to the variable capacitance devices that has low impedance at predetermined frequencies to suppress those frequencies and also suppress harmonics and mixing products resulting from mixing of various frequencies.
Claims14
A tunable filter comprising:
- a first tunable capacitor circuit comprising:
- a first variable capacitance device and a second variable capacitance device connected in series, the first and second variable capacitance devices being of unequal sizes;
- and
- a low impedance circuit connected in parallel with the series connected variable capacitance devices, the low impedance circuit configured to reduce a third order distortion in signals output by the first and second variable capacitance devices;
- and
- an inductor connected to the first tunable capacitor circuit to form a resonant circuit.
3 more elements
A circuit comprising:
- a first variable capacitance device and a second variable capacitance device connected in series, the first and second variable capacitance devices being of unequal sizes;
- and
- a low impedance circuit, for suppressing predetermined frequencies to reduce a third order distortion in signals output by the first and second variable capacitance devices, the low impedance circuit having two terminals connected in parallel with the series connected variable capacitance devices.
A method comprising:
- connecting a pair of variable capacitance devices in series, the first and second variable capacitance devices being of unequal sizes;
- and
- connecting a low impedance circuit in parallel with the series connected variable capacitance devices, the low impedance circuit configured to suppress third order distortion of signals output by the variable capacitance devices.
Dependencies are inferred from the claim text.