Discussion and Conclusions

0 1 2 3 4 5 6 7 8 9 10 11

Fig. A-19 (a)The modified S21 simulation

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3 4 5 6 7 8 9 10 11

Frequency (GHz) 1

2 3 4 5 6 7

Measurement Simulation Modify

Fig. A-19 (b) The modified NF simulation

Fig. A-19 shows the modified of larger block post-simulation，which could approach the measurement a little. Besides, the S21 measurement result shows the first peak that occur at resonance shunt-peaking lower than expected, that might be due to transformer mutual coupling inductance. According to table 4-3, the phenomenon is like the condition of maximum bandwidth.

Table 4-3 Shunt-peaking summary [12].

Condition m=R²C/L Normalized Bandwidth

Normalized peak frequency response

Maximum bandwidth ~1.41 ~1.85 1.19

Max. flat frequency response ~2.41 ~1.72 1

No shunt peaking ∞ 1 1

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Vita and Publication

姓 名: 廖昱舜 學 歷:

國立板橋高級中學 ( 88 年 9 月 ~ 91 年 6 月)

國立中正大學電機工程學系 ( 91 年 9 月 ~ 95 年 6 月) 國立交通大學電信工程所碩士班 ( 95 年 9 月 ~ 97 年 6 月)

Publication Remarks:

1. Yu-Shun Liao, Christina.F. Jou,“X-band low phase noise Quadrature CMOS VCO with transformer feedback”, PIERS 26-30, March, 2008 in Hangzhou.

Submitting Papers:

1. Yu-Shun Liao, Yi-Shing Shen, and Christina F. Jou,“A 5.25-GHz Ultra Low Power Voltage-Controlled Oscillator Using Transformer Feedback”, APMC, Dec, 2008 in Hong Kong.

2. Yu-Shun Liao, Yi-Shing Shen, and Christina F. Jou,“Low Voltage Multi-Band

Voltage-Controlled Oscillator for MB-OFDM UWB system”, APMC, Dec, 2008 in Hong Kong.