Now, the VCO is to give a local oscillator (LO) signal in a heterodyne transmitter shown below (Fig. 3.2) with the carrier frequency fRF = 900 MHz, determine the output frequency of the VCO. Accordingly, sketch the amplitude spectrum of the power amplifier output driving the antenna. Assume realistic LO feedthrough (i.e. leakage of the LO signals to other mixer ports).

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(d). Now, the VCO is to give a local oscillator (LO) signal in a heterodyne transmitter shown below
(Fig. 3.2) with the carrier frequency fRF 900 MHz, determine the output frequency of the
VCO. Accordingly, sketch the amplitude spectrum of the power amplifier output driving the
antenna. Assume realistic LO feedthrough (i.e. leakage of the LO signals to other mixer ports).
fRE
= 900 MHz
Fig. 3.2
= ?
LO
O
fIE
= 15 MHz
Transcribed Image Text:(d). Now, the VCO is to give a local oscillator (LO) signal in a heterodyne transmitter shown below (Fig. 3.2) with the carrier frequency fRF 900 MHz, determine the output frequency of the VCO. Accordingly, sketch the amplitude spectrum of the power amplifier output driving the antenna. Assume realistic LO feedthrough (i.e. leakage of the LO signals to other mixer ports). fRE = 900 MHz Fig. 3.2 = ? LO O fIE = 15 MHz
A final year project student, Raphael, learns in EEE307 that an oscillator circuit with a differential
output can be built using single-ended tuned amplifiers like the one shown below:
VDD
C₁=R4₁
- Vout
VinM₁
Fig. 3.1 Single-ended tuned amplifier schematic (image adapted from B. Razavi ©2012)
Transcribed Image Text:A final year project student, Raphael, learns in EEE307 that an oscillator circuit with a differential output can be built using single-ended tuned amplifiers like the one shown below: VDD C₁=R4₁ - Vout VinM₁ Fig. 3.1 Single-ended tuned amplifier schematic (image adapted from B. Razavi ©2012)
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