Multiplying Digital-to-Analog Converter

An apparatus, comprising:

• a resistive digital-to-analog converter (RDAC) having a reference voltage terminal, a digital input terminal, and an output;
• and
• a digitally-controlled impedance circuit having a control input and an output, the output of the digitally-controlled impedance circuit coupled to the output of the RDAC.

An apparatus, comprising:

• a first resistive digital-to-analog converter (RDAC) having a ground terminal and a first output, the first RDAC includes a first resistor segment coupled to the ground terminal, the first resistor segment including a first resistor and a first selection circuit, the first selection circuit having an input coupled to the first resistor and having a first selection circuit output coupled to the first output and a second selection circuit output coupled to the ground terminal;
• and
• a second RDAC having a first reference voltage terminal and a second output, the second output coupled to the first output, the second RDAC including a second resistor segment coupled to the first reference voltage terminal, the second resistor segment including a second resistor and a second selection circuit, the second selection circuit having an input coupled to the second resistor and having a third selection circuit output coupled to the first selection circuit output and a fourth selection circuit output coupled to the ground terminal.