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Circuit makes simple FSK modulator - 10/11/01 EDN-Design Ideas: The need for a compact
telemetry system poses a challenge for designing a small, light, low-component-count
system. Interfacing serial data from the microprocessor is also difficult because most
low-cost RF transmitters do not accept dc levels at the input. Commercial FSK
(frequency-shift-keying)modulators are bulky and need many passive components.....(design
idea added 1/05)
Low Cost Programmable Oscillator Operates at 2 GHz - 05/11/00 EDN-Design Ideas: All
wireless communication systems need a local oscillator. Figure 1 shows a low-cost PLL
circuit for the 2-GHz band for such applications as industrial, scientific, and medical (ISM)and
satellite personal-communication systems (S-PCS). The central.....(design idea added 7/03)
Diode Frequency Doublers - Ordinary fast switching silicon diodes, special fast
recovery junction diodes, schottky barrier diodes, varactors and even old-fashioned
germanium diodes or vacuum tubes may be used to construct signal powered frequency
doublers.....(electronic circuit added 7/03)
