Spread spectrum applications of universal frequency translation

A system to down-convert and de-spread a spread spectrum signal, comprising:

• a first circuit configured to modulate an oscillating signal based on a spreading code, and to generate a control signal that comprises a plurality of pulses;
• and
• a second circuit configured to transfer charge from said spread spectrum signal and integrate said charge over multiple cycles of said spread spectrum signal as a function of said control signal;
• wherein the second circuit comprises a switch controlled by said control signal to under-sample the spread spectrum signal, resulting in under-samples.

A system to down-convert and de-spread a spread spectrum signal, comprising:

• a first circuit configured to modulate an oscillating signal based on a spreading code, and to generate a control signal that comprises a plurality of pulses;
• and
• a second circuit configured to transfer charge from said spread spectrum signal and integrate said charge over multiple cycles of said spread spectrum signal as a function of said control signal;
• wherein the second circuit further comprises a storage device coupled to a switch to store said charge, wherein successive samples of said charge form said de-spread baseband signal.