Transimpedance amplifiers with adjustable input range

A system to convert a single-ended current input to a differential voltage output, the system comprising:

• a first amplifier circuit, having an output for providing a first amplifier output generated by the first amplifier circuit based on the single-ended current input;
• a second amplifier circuit, having a differential input that includes a first input and a second input, the second amplifier circuit to generate the differential voltage output based on:
• receiving a signal based on the first amplifier output at the first input, and
• receiving a signal based on an output offset current at the second input;
• and
• a clamp circuit, coupled to the output of the first amplifier circuit, and further coupled to a control signal that is to set one of a minimum voltage value or a maximum voltage value for the first amplifier output based on the output offset current,
• wherein:
• the first amplifier circuit includes a first transistor and a second transistor,
• the clamp circuit includes a third transistor,
• each of the first transistor, the second transistor, and the third transistor includes a first terminal, a second terminal, and a third terminal,
• the first terminal of the third transistor is coupled to the third terminal of the second transistor,
• the first terminal of the second transistor is coupled to the output of the first amplifier circuit,
• the first amplifier circuit is to receive the single-ended current input at the third terminal of the first transistor, and
• the second terminal of the first transistor is coupled to the third terminal of the second transistor.

A system to convert a single-ended current input to a differential voltage output, the system comprising:

• a first amplifier circuit, comprising a first transistor and a second transistor, and having an output for providing a first amplifier output generated by the first amplifier circuit based on the single-ended current input;
• a second amplifier circuit, having an input to receive an output offset current;
• a third amplifier circuit, having a differential input that includes a first input and a second input, and to generate the differential voltage output based on:
• receiving, at the first input, a signal based on the first amplifier output, and
• receiving, at the second input, a signal generated by the second amplifier circuit based on the output offset current received by the second amplifier circuit;
• and
• a clamp circuit, comprising a third transistor, the clamp circuit coupled to the output of the first amplifier circuit, and further coupled to a control signal to set one of a minimum voltage value or a maximum voltage value for the first amplifier output based on the output offset current,
• wherein:
• when the control signal is to set the maximum voltage value, each of the first transistor and the second transistor is an N-type transistor, and the third transistor is a P-type transistor, and
• when the control signal is to set the minimum voltage value, each of the first transistor and the second transistor is a P-type transistor, and the third transistor is an N-type transistor.