The instantaneous oscillation frequency is set by the voltage on the FM input. ![]() For example, let … In electronic communications, a balanced modulator is a circuit that produces double-sideband suppressed-carrier (DSBSC) signals: It suppresses the radio frequency carrier thus leaving the sum and difference frequencies at the output. In this second blog post in my FPGA SDR Transceiver series, I will discuss how CW, SSB, and AM modulation and demodulation are accomplished within the FPGA. ![]() Am modulation ltspice Scaling a 5V DAC signal to fit in the smaller voltage range does not increase the dimming fidelity, it's still ~5 distinct steps in output current.
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