一篇vco论文

myoklover

如题
A critical building block of almost any wireless or wireline transceiver is the local oscillator
(LO). When used with a mixer, the LO allows frequency translation and channel selection
of radio frequency (RF) signals. The LO is typically implemented as a phase-locked
loop (PLL), wherein a voltage-controlled oscillator (VCO) is phase-locked to a high-stability
crystal oscillator. A VCO is basically comprised of a gain element and a resonator.
The resonator determines the oscillation frequency, and when it is composed of energystoring
inductors and capacitors, it is often referred to as an LC tank. A voltage-controlled
varactor diode allows the oscillation frequency of the VCO to be varied.
The most critical performance specification for an oscillator is phase noise. In a
receiver, the phase noise of the LO limits the ability to detect a weak signal in the presence
of a strong signal in an adjacent channel. In a transmitter, phase noise results in energy
being transmitted outside of the desired band. To help minimize phase noise, we need
high-Q (low-loss) inductors and capacitors.

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