Methods and apparatus for calibrating output voltage levels associated with current-integrating summing amplifier
First Claim
1. Apparatus for calibrating output voltage levels of a current-integrating summing amplifier, comprising:
- a duplicate integrator circuit, wherein the duplicate integrator circuit replicates an integrator circuit of the current-integrating summing amplifier;
a comparing circuit coupled to the duplicate integrator circuit, the comparing circuit comparing at least one output voltage level generated by the duplicate integrator circuit with a reference voltage level; and
a feedback loop circuit coupled to the comparing circuit and the duplicate integrator circuit, the feedback loop circuit adjusting at least one bias signal of the duplicate integrator circuit so that the output voltage level generated by the duplicate integrator circuit matches the reference voltage level, wherein the bias signal is applied to the integrator circuit of the current-integrating summing amplifier thereby calibrating output signal components due to multiple input signals of the current-integrating summing amplifier.
7 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatus are disclosed for calibrating summing amplifiers based on current integration. For example, apparatus for calibrating output voltage levels of a current-integrating summing amplifier includes the following components. A duplicate integrator circuit is provided, wherein the duplicate integrator circuit replicates an integrator circuit of the current-integrating summing amplifier. A comparing circuit, coupled to the duplicate integrator circuit, is provided for comparing at least one output voltage level generated by the duplicate integrator circuit with a reference voltage level. A feedback loop circuit, coupled to the comparing circuit and the duplicate integrator circuit, is provided for adjusting at least one bias signal of the duplicate integrator circuit so that the output voltage level generated by the duplicate integrator circuit matches the reference voltage level, wherein the bias signal is applied to the integrator circuit of the current-integrating summing amplifier thereby calibrating output signal components due to multiple input signals of the current-integrating summing amplifier.
-
Citations
18 Claims
-
1. Apparatus for calibrating output voltage levels of a current-integrating summing amplifier, comprising:
-
a duplicate integrator circuit, wherein the duplicate integrator circuit replicates an integrator circuit of the current-integrating summing amplifier; a comparing circuit coupled to the duplicate integrator circuit, the comparing circuit comparing at least one output voltage level generated by the duplicate integrator circuit with a reference voltage level; and a feedback loop circuit coupled to the comparing circuit and the duplicate integrator circuit, the feedback loop circuit adjusting at least one bias signal of the duplicate integrator circuit so that the output voltage level generated by the duplicate integrator circuit matches the reference voltage level, wherein the bias signal is applied to the integrator circuit of the current-integrating summing amplifier thereby calibrating output signal components due to multiple input signals of the current-integrating summing amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A decision feedback equalizer, comprising:
-
a current-integrating summing amplifier for summing input signals and tap weight-adjusted feedback signals; a calibration circuit coupled to the current-integrating summing amplifier and configured to calibrate output signal components due to multiple input signals of the current-integrating summing amplifier; and a decision block coupled to the current-integrating summing amplifier for detecting bits in the input signals; wherein the calibration circuit further comprises; a duplicate integrator circuit, wherein the duplicate integrator circuit replicates an integrator circuit of the current-integrating summing amplifier; a comparing circuit coupled to the duplicate integrator circuit, the comparing circuit comparing at least one output voltage level generated by the duplicate integrator circuit with a reference voltage level; and a feedback loop circuit coupled to the comparing circuit and the duplicate integrator circuit, the feedback loop circuit adjusting at least one bias signal of the duplicate integrator circuit so that the output voltage level generated by the duplicate integrator circuit matches the reference voltage level, wherein the bias signal is applied to the integrator circuit of the current-integrating summing amplifier thereby calibrating output signal components due to multiple input signals of the current-integrating summing amplifier. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification