Patent ID: 7321751

Claim:
An apparatus for improving dynamic range, comprising: a frequency down-conversion module that receives an input signal; and a bias circuit comprising: a first resistor with a first terminal coupled to a bias point and a second terminal coupled to a first voltage reference; and a second resistor with a first terminal coupled to said bias point and a second terminal coupled to a second voltage reference; wherein said bias point is coupled to said input signal; wherein said frequency down-conversion module comprises a switch and a storage element; wherein the switch transfers energy from the input signal to the storage element by non-impulse under-sampling the input signal according to non-impulse pulses of a control signal; wherein an output signal is generated by integrating the transferred energy; wherein the bias point is configured to bias the input signal to have a center voltage that varies within a minimum and a maximum of a voltage range of the control signal; and wherein said frequency down-conversion module outputs a down-converted output signal.