US 9,813,050 B1
Comparator circuit with input attenuator
Christopher C. McQuilkin, Hollis, NH (US)
Assigned to Analog Devices, Inc., Norwood, MA (US)
Filed by Analog Devices, Inc., Norwood, MA (US)
Filed on Apr. 13, 2016, as Appl. No. 15/97,954.
Int. Cl. H03K 5/24 (2006.01)
CPC H03K 5/2418 (2013.01) [H03K 5/24 (2013.01); H03K 5/2409 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
an input node configured to receive an input signal;
a reference node configured to receive a reference signal;
a comparator circuit, including first and second comparator inputs and a comparator output, the second comparator input coupled to the reference node;
a conditioning circuit, coupled to the input node and to the first comparator input, wherein the conditioning circuit passes the input signal from the input node to the first comparator input when a magnitude of the input signal is substantially the same as a magnitude of the reference signal, and wherein the conditioning circuit passes an attenuated portion of the input signal from the input node to the first comparator input when the magnitude of the input signal is substantially different than the magnitude of the reference signal; and
an attenuation circuit, including:
a first signal attenuator coupled to the input node and the first comparator input, wherein the first signal attenuator is configured to present an attenuated portion of the input signal to the first comparator input; and
an electrical load circuit coupled to the first and second comparator inputs, wherein the electrical load circuit provides an electrical load to the conditioning circuit and to the first signal attenuator.