Method and apparatus for low latency proportional path in a digitally controlled system
AssigneeInternational Business Machines Corporation
InventorsAlexander V. Rylyakov, Jose A. Tierno
Life of this patent
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Abstract
A digitally controlled circuit and method includes an error input coupled to a proportional path. The proportional path includes a selector which directly receives the error input as a select signal. The selector receives a proportional control weight from a location other than the proportional path wherein the proportional control weight is input to a digitally controlled oscillator (DCO).
Claims19
A control circuit, comprising:
- an error input coupled to a proportional path and an integral path;
- and
- the proportional path including a selector which directly receives the error input as a select signal, the selector receiving a proportional control weight from a location other than the proportional path wherein the proportional control weight is input to a digitally controlled oscillator (DCO) with near-zero delay.
A proportional-integral-derivative (PID) controller circuit, comprising:
- an error input connected to a proportional path and an integral path;
- the proportional path including a multiplexer which directly receives the error input as a select signal, the multiplexer receiving at least one proportional control weight from a location other than the proportional path wherein the at least one proportional control weight includes bits which are static or settled to provide near-zero delay of the at least one proportional control weight as input to a digitally controlled oscillator (DCO);
- and
- the integral path including a multiplier and integrator for processing an integrator weight for the DCO.
A method for reducing latency and power dissipation in a digitally controlled circuit, comprising:
- inputting an error signal to a proportional path and an integral path;
- receiving the error signal as a select signal for a selector;
- receiving a proportional control weight from a location other than the proportional path wherein the proportional control weight is input to a digitally controlled oscillator (DCO) with near-zero delay;
- and
- processing an integrator weight on the integral path for the DCO.
Dependencies are inferred from the claim text.