Total design circuit

Finally, the integration of mixer, VCO, and balun is achieved for optimal current-reused. As shown in Fig. 4.7, we can see the whole

Fig. 4.7 Final proposed schematic of the integration 4.2 Simulation Results

Fig. 4.8 shows the magnitude of S11 and S21. Fig. 4.9 shows the tuning range and phase noise of VCO . The conversion gain and P1dB of the proposed design in 5.2GHz and 5.8GHz are presented from Fig. 4.10 and Fig. 4.11. Table 4.1 summarizes the performance of simulation results.

Fig. 4.8 the magnitude of S11 and S21

(a) Tuning range of VCO

(b) Phase noise of VCO

Fig. 4.9 Tuning range and phase noise of VCO

Conversion gain of 5.2GHz is 15.6dB

(a) conversion gain in 5.2GHz

P1dB of 5.2GHz is -17dB

(b) conversion gain in 5.2GHz Fig. 4.10 conversion gain and P1dB in 5.2GHz

Conversion gain of 5.8GHz is 14.6dB

(a) conversion gain in 5.8GHz

P1dB of 5.8GHz is -16dB

(b) conversion gain in 5.8GHz Fig. 4.11conversion gain and P1dB in 5.8GHz

Table 4.1 Simulation results of mixer and VCO

Performance of mixer and VCO with balun

5.2 GHz 5.8 GHz

VDD 1.4 V

Power consumption 6.12 mW

Input return loss 12 dB 16 dB

Output return loss 12 dB 12 dB

Conversion Gain 15.6 dB 16.6 dB

P1dB -17 dB -16 dB

Phase noise -105 dBc/1MHz -105 dBc/1MHz

LO power -8 dBm -6 dBm

LO to RF <-30 dB <-30 dB

4.3 Comparison and Summary

The comparison of the proposed design that contains mixer and VCO with balun against recently reported is shown in Table 4.2.

Table 4.2 Comparison of Mixer and VCO

specification This work 2005[27]

ISCAS Frequency(GHz) 5.2/ 5.8GHz 5GHz 4.2GHz 1.7

S

(dB) <-12 <-10 <-10 <-31 Supply voltage(V) 1.4 2 1 --

conversion gain(dB) 15.6/16.6

@5.2/5.8GHz

Chapter 5 Conclusion

In this thesis, we present low noise amplifier with notch filters and the integration that consists of mixer and VCO with balun. These proposed circuits are fabricated using a standard TSMC 0.18um CMOS process.

In chapter 3, a low noise amplifier with notch filters for UWB application is presented. First, a low noise amplifier which is added bulk resistance with low power for 3~10GHz is presented. The measurement result of LNA shows the power gain is more than 9.5dB in 3~10GHz, return loss is under -5.4dB, minimum noise figure is 2.6dB, and power consumption exclude buffer is 6.8 mW. Second, the LNA which is added notch filters realized by active inductors for 3~5GHz is presented. The core area of this design is only 0.0016mm². The measurement result of LNA with notch filter shows the power gain is 8~12dB, return loss is under -7.5dB. The suppressed performance of notch filters in 2.5GHz and 5.2 GHz are 19dB and 38dB. The power consumption is 10.3 mW. The simulation results of minimum noise figure and P1dB are 2dB and -14.2dB.

In chapter 4, the integration of mixer, VCO, and balun which is achieved for optimal current-reused is presented. The bandwidth is 5~6GHz for WiMAX which concludes. The chip area is 1mmx1.5mm.

The simulation results in 5.2GHz and 5.8GHz show the mixer conversion gain are 15.6dB and 16.6dB, return loss is under -12dB, P1dB are -17dB and -16dB. The phase noise of VCO in 5.2GHz and 5.8GHz are -105 dBc/MHz. The total power consumption is 6.12mW.

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