MC13175D 查看數據表（PDF） - Motorola => Freescale

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MC13175D

UHF FM/AM TRANSMITTER

Motorola => Freescale 

MC13175 MC13176

In the design example, shown in Figure 29, the operating

point is selected as a tradeoff between average power output

and quality of the AM.

For VCC = 3.0 Vdc; lCC = 18.5 mA and Imod = 0.5 mAdc and

a static DC offset of 1.04 Vdc, the circuit shown in Figure 29

completes the design. Figures 30, 31 and 32 show the results

of – 6.9 dBm output power and 100% modulation by the 10

kHz and 1.0 MHz modulating sinewave signals. The

amplitude of the input signals is approximately 800 mVp–p.

Where Rmod = (VCC – 1.04 Vdc)/0.5 mA = 3.92 k, use a

standard value resistor of 3.9 k.

Figure 29. Analog AM Transmitter

VCC

3.9k 1.04Vdc 560

16

3.0Vdc Rmod

0.8Vdc

Data

+

Input

800mVp–p 6.8µ

Figure 30. Power Output of Unmodulated Carrier

Figure 31. Input Signal and AM Modulated

Carrier for fmod = 10 kHz

Figure 32. Input Signal and AM Modulated

Carrier for fmod = 1.0 MHz

16

MOTOROLA RF/IF DEVICE DATA

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