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US 8,947,142 B2Granted
Common mode trimming with variable duty cycle
AssigneeCypress Semiconductor Corporation
InventorKendall V. Castor-Perry
Life of this patent
Estimating the term…
Abstract
A resistive divider circuit may be operatively coupled with a modulated resistor circuit, wherein the resistive divider circuit and the modulated resistor circuit for an effective resistor circuit providing an effective attenuation. A variable duty cycle signal modulates the modulated resistor circuit to control the effective attenuation.
Claims21
An apparatus comprising:
- a resistive divider circuit, comprising a first resistor and a second resistor;
- a modulated resistor circuit, operatively coupled to the resistive divider circuit, wherein the second resistor and the modulated resistor circuit form an effective resistor circuit providing an effective attenuation;
- and
- a variable duty cycle generator, to generate a variable duty cycle signal, wherein the variable duty cycle signal modulates the modulated resistor circuit to control the effective attenuation until an output of a differential circuit is within a predetermined range.
1 more element
A method comprising:
- receiving a first signal as an input to a resistive divider circuit, the resistive divider circuit comprising a first resistor and second resistor;
- receiving a variable duty cycle signal at a modulated resistor circuit, wherein the modulated resistor circuit is operatively coupled to the resistive divider circuit;
- modulating the modulated resistor circuit, based on the variable duty cycle signal, wherein the modulated resistor circuit and the second resistor are configured to form an effective resistor circuit providing an effective attenuation;
- and
- attenuating the first signal, wherein the effective resistor circuit controls the attenuation of the first signal.
2 more elements
A method comprising:
- receiving a common mode signal at an input of a resistive attenuator network, wherein the resistive attenuator network is operatively coupled to the inputs of a differential circuit;
- and
- adjusting an attenuation of the resistive attenuator network, based on varying a duty cycle of a signal, until an output of the differential circuit reaches a value approximating zero.
Dependencies are inferred from the claim text.