High Order Harmonic Oscillators in Microwave and Millimeter-wave ...

3 8th Harmonic Oscillator
harmonic signal and the improvement of the phase noise are the remained problems here
after. Comparing with the other V -band oscillators [16], [27], [28], the similar output
performance is obtained in spite of the high order harmonic oscillator. This oscillator
obtains relatively good output power and almost equal phase noise performances for two
HEMTs in X-band.
51.3
0
51.2
-10
Frequency (GHz)
51.1
51.0
50.9
-20
-30
-40
Output power (dBm)
50.8
-50
50.7
0.5
1.0
1.5
2.0
2.5
3.0
3.5
-60
Drain Voltage (V)
Fig. 3.12: Measured oscillating frequency and output power as a function of drain bias
voltage.
39