US 2016/0079959 A1Published application

Programmable step attenuator with cross connection

AssigneeTexas Instruments Incorporated

InventorRajendrakumar Joish

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Abstract

Disclosed examples include a programmable attenuator circuit providing selective cross coupling of impedance components between circuit input nodes and output nodes according to control signals to set or adjust an attenuation value of the attenuator circuit. The attenuator circuit includes a plurality of attenuator impedance components, and a switching circuit to selectively connect at least a first attenuator impedance component between the first input node and the second output node, to selectively connect at least a second attenuator impedance component between the second input node and the first output node, to selectively connect a third attenuator impedance component between the first input node and the first output node, and to selectively connect a fourth attenuator impedance component between the second input node and the second output node.

Claims23

Dependent claims

An attenuator circuit, comprising:

a first input node to receive a first input voltage signal;
a second input node to receive a second input voltage signal;
a first output node to provide a first output signal;
a second output node to provide a second output signal;
a first impedance circuit, including a plurality of first impedance components coupled with the first input node;
a plurality of first switching circuits individually coupled with a corresponding one of the first impedance components, the individual first switching circuits operative to electrically connect the corresponding first impedance component to the first output node when a corresponding first control signal is in a first state, and to electrically connect the corresponding first impedance component to the second output node when the corresponding first control signal is in a second state;
a second impedance circuit, including a plurality of second impedance components coupled with the second input node;
and
a plurality of second switching circuits individually coupled with a corresponding one of the second impedance components, the individual second switching circuits operative to electrically connect the corresponding second impedance component to the first output node when a corresponding second control signal is in a first state, and to electrically connect the corresponding second impedance component to the second output node when the corresponding second control signal is in a second state.

6 more elements

An attenuator circuit, comprising:

an input circuit, including a first input node to receive a first input voltage signal, and a second input node to receive a second input voltage signal;
an output circuit, including a first output node to provide a first output signal, and a second output node to provide a second output signal;
a plurality of attenuator impedance components;
a switching circuit operative to selectively connect at least a first one of the attenuator impedance components between the first input node and the second output node, and to selectively connect at least a second one of the attenuator impedance components between the second input node and the first output node;
and
an output impedance component coupled between the first and second output nodes.

3 more elements

Dependencies are inferred from the claim text.