modes of operation selected by means of the mode-select signals from the receiver control circuits. The
receiver consists of a preamplifier section, a converter section, an amplifier-converter section, a preselector
section, a demodulator section, a baseband amplifier section, and a control section.
Figure 3-8. Simplified phase-lock receiver block diagram.
LEARNING EVENT 29: PREAMPLIFIER
The components contained in the receiver's preamplifier are usually located as near as the antenna possible to
provide for maximum receiver sensitivity. The input signals are coupled directly from the antenna to the
preamplifier. The preamplifier section of the simplified receiver contains a parametric amplifier and a TWT.
1. A low-noise cryogenic parametric amplifier is used in the preamplifier to provide sufficient gain and to
ensure an equivalent noise temperature of less than 200€ Kelvin for
SS0031
3-24
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