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US 6,587,017 B1Granted
Method and apparatus for calibrated phase-shift networks
AssigneeLSI Logic Corporation
InventorsSamuel W. Sheng, Lapoe E. Lynn
Life of this patent
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Abstract
An apparatus comprising a first calibration circuit and a phase shift network stage. The first calibration circuit may be configured to generate a control signal. The phase shift network stage may comprise one or more tunable phase shift elements and be configured to provide a tunable impedance. The phase shift network stage may be tuned in response to the control signal and a conductance of the tunable phase shift elements.
Claims16
An apparatus comprising:
- a first calibration circuit configured to generate a control signal;
- and
- a plurality of phase shift network stages each (a) configured to provide a tunable impedance, and (b) comprising one or more tunable phase shift elements, wherein (i) each phase shift network stage is tuned in response to said control signal and a conductance of said tunable phase shift elements and (ii) each phase shift network is programmable.
A method for calibrating a phase shift network, comprising the steps of:
- (A) generating a control signal;
- and
- (B) tuning an impedance to phase shift an input signal in response to said control signal and a conductance, wherein step (B) is digitally controlled and further comprises (i) tuning a tunable capacitance and (ii) tunable resistance.
An apparatus comprising:
- a first calibration circuit configured to generate a multi-bit control signal;
- and
- a phase shift network stage configured to provide a tunable impedance, comprising one or more tunable phase shift elements, wherein (i) each of said phase shift elements comprises a resistor circuit having a tunable resistance, (ii) said phase shift network stage is tuned in response to (a) said multi-bit control signal and (b) a conductance of said tunable phase shift elements and (iii) said resistor circuit is configured in response to said multi-bit control signal, wherein said phase shift network stage is programmable.
An apparatus comprising:
- a first calibration circuit configured to generate a control signal;
- and
- a phase shift network stage configured to provide a tunable impedance, comprising one or more tunable phase shift elements, wherein (i) each of said phase shift elements comprises a resistor circuit (a) having a tunable resistance and (b) comprising a plurality of resistors and a plurality of switches coupled to said resistors and configured to provide tunable conductance, (ii) said phase shift network stage is tuned in response to said control signal and a conductance of said tunable phase shift elements and (iii) said phase shift network is programmable.
Dependencies are inferred from the claim text.