Performance Evaluation of Electronic Oscillators by Amal Banerjee

Author:Amal Banerjee
Language: eng
Format: epub
ISBN: 9783030256784
Publisher: Springer International Publishing

3.3 1800 MHz (1.8 GHz) Common-Emitter Negative Resistance Clapp Resonator GSM Carrier Frequency Oscillator

The C computer language [7] executable amplifierce (available for both the popular Linux and Windows operating systems) computes the transistor biasing network component values

(RC, RE, RB1RB2, CEMITTERBYPASS) for common-emitter negative resistance Clapp resonator oscillator (Chap. 2, Sect. 2.​5.​1). The Clapp resonator component values (C2, C3) are computed using the given values for (). The key sampling time/interval (for SPICE [8] transient analysis) for a 1800 MHz common-emitter negative resistance oscillator is computed easily. The results are formatted as a text SPICE input format netlist that can be used with any open-source or proprietary SPICE simulator. The target oscillation frequency 1800 MHz (1.8 GHz) is the carrier frequency for the GSM standard wireless telephone network, used worldwide. amplifierce can be used in both interactive or batch–command line argument mode, but it is preferable to use it in the command line argument mode, to preserve the correct order of input parameters—e.g., if the values of the transistor’s DC forward current gain (hFE or beta) and the collector current are interchanged by mistake, incorrect results are generated.

The key SPICE transient analysis sampling time for each of the design examples in this chapter has been set at to satisfy Nyquist theorem that the sampling time be at least 2× the highest frequency component in the signal being processed. The factor 60 ensures that all harmonics up to the fifth harmonic are captured without aliasing. The sampling interval is also used to compute the frequency bins for the discrete Fourier transform power spectrum calculation. The signal time period is the time period for the target fundamental frequency. The sampling time can be easily edited in the generated SPICE netlist, to any value of the designer’s choice.

Typing ./amplifierce at the Linux shell window prompt generates the following help information:

$ ./amplifierce

incorrect|insufficient arguments

interactive mode ...

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