Lect13_VCOs I

Lect13_VCOs I - ECE 894 RF and mmWave Front-end Circuit...

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ECE 894 RF and mmWave Front-end Circuit Design Prof. Waleed Khalil Lecture VCOs I 13 1
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Oscillators The oscillator generates a signal with a stable and controllable frequency LO reference frequency for downconversion and upconversion Analog (e.g. A/D and D/A) sampling clock Digital I/O Low frequency reference clock (e.g. crystal oscillator) Oscillator vs. voltage-controlled oscillator (VCO) VCO: variable oscillator frequency thru voltage 2 x(t) y(n) A/D f clk x(t) y(n) D/A TX RX Analog Digital : I/O RF: Up/Dn Convert
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Oscillators Parameters (1/3) Tuning gain/range Voltage tuning gain K vco Frequency tuning range 2 (f max -f min )/(f max +f min ) Phase noise Single sideband noise power at a frequency offset Δ f relative to carrier power with a measurement bandwidth of 1 Hz 3 f o f =f o +K vco V V min V max f min f max 0 K vco f o f o + f f o - f Carrier P C P SSB P SSB P C PSD ( ,1 ) ( ) 10log / o SSB c P f f Hz L f dBc Hz P  +∆ ∆=  
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Oscillators Parameters (2/3) Harmonic suppression Mixing Intermodulation problem Spectrum mask Figure-of-Merit (FoM)
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Lect13_VCOs I - ECE 894 RF and mmWave Front-end Circuit...

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