Square wave local oscillator technique for direct conversion receiver
OwnerChing-Lang Lininventor
Life of this patent
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Abstract
The present invention provides a square wave local oscillator (LO) technique, applicable to devices or systems using Improved Harmonic Boosting Technique (IHBT), for achieving a DC-offset free Zero-IF signal in direct conversion receiver (DCR). A down converter using anti-parallel diode pair (APDP) cell or a modified Gilbert cell circuit mixes a received radio frequency (RF) signal with a LO signal having a square wave shape. A LO signal with a square wave-forming network provides the square wave forming circuit. A voltage control oscillator (VCO) generates a lower even order base frequency of the received RF signal.
Claims19
A square wave local oscillator method for a direct conversion receiver that comprises the steps of:
- generating an output with a voltage-controlled oscillator (VCO), wherein the VCO generates sinusoidal output LOe1;
- producing a square wave output with a frequency identical to that of sinusoidal output LOe1 with a square wave-forming network;
- inputting said square wave LO output into a down converter;
- mixing a received RF signal with square wave LO to produce a zero intermediate frequency signal in said down converter.
A square wave local oscillator apparatus for a direct conversion receiver that comprises:
- a voltage controlled oscillator (VCO), wherein the VCO generates sinusoidal output LOe1;
- a square wave-forming network that produces a square wave output with a frequency identical to that of sinusoidal output LOe1;
- a down converter that receives said square wave LO output and mixes a received RF signal with square wave LO to produce a zero intermediate frequency signal.
A square wave local oscillator technique for a direct conversion transmitter that comprises the steps of:
- generating an output with a voltage controlled oscillator (VCO), wherein the VCO generates sinusoidal output LOe1;
- producing a square wave output with a frequency identical to that of sinusoidal output LOe1 with a square wave-forming network;
- inputting said square wave LO output into an up converter;
- mixing a received RF signal with square wave LO to produce a zero intermediate frequency signal in said up converter.
A square wave local oscillator apparatus for a direct conversion transmitter that comprises:
- a voltage controlled oscillator (VCO), wherein the VCO generates sinusoidal output LOe1;
- a square wave-forming network that produces a square wave output with a frequency identical to that of sinusoidal output LOe1;
- an up converter that receives said square wave LO output and mixes a received RF signal with square wave LO to produce a zero intermediate frequency signal.
Dependencies are inferred from the claim text.