Fully-differential programmable gain amplifier

A fully-differential programmable gain amplifier comprising:

• a first input;
• a second input;
• a first output;
• a second output;
• a programmable gain module coupled to the first input and the second input, the programmable gain module including
• a first resistive ladder network coupled to the first input,
• a first set of switches for the first resistive ladder network, the first set of switches coupled to a first current mode output,
• a second resistive ladder network coupled to the second input,
• a second set of switches for the second resistive ladder network, the second set of switches coupled to a second current mode output,
• a data latch circuit configured to
• control the first set of switches for the first resistive ladder network to provide output to the first current mode output, and
• control the second set of switches for the second resistive ladder network to provide output to the second current mode output;
• an amplifier coupled to the first current mode output, the second current mode output, and the data latch circuit, the amplifier configured to apply common mode voltage to the data latch circuit;
• and
• a current-to-voltage converter coupled to the first current mode output, the second current mode output, the first output and the second output, the current-to-voltage converter configured to
• receive at least one output current mode signal from the first current mode output and the second current mode output, and
• produce an output signal by converting differential input received from the at least one output current mode signal from the first current mode output and the second current mode output.

A method for a fully-differential programmable gain amplifier, the method comprising:

• receiving, by a programmable gain module of the fully-differential programmable gain amplifier, an input signal;
• receiving, by the programmable gain module, a control signal;
• supplying, by the programmable gain module, at least one output current mode signal from to first current mode output and to a second current mode output to provide a differential input signal, wherein output of the programmable gain module is in response to the control signal;
• sensing, by an amplifier of the a fully-differential programmable gain amplifier, a common mode voltage to feed a common mode of the programmable gain module;
• and
• producing, by a current-to-voltage converter of the fully-differential programmable gain amplifier, an output signal by converting the differential input signal to output an amplified input signal based on the control signal.