3.2.4
Dual-Loop Indirect Synthesis
The output of a synthesized signal generator is phase-locked to a stable reference signal, such as
that produced by a crystal oscillator to give the generator output the stability and accuracy of
the reference. However, this can be difficult to achieve in broad-band generators.
Giga-tronics employs a dual-loop synthesis technique to produce stable and spectrally pure
frequencies over a wide frequency range. The two loops are (1) the output loop, which
phase-locks the synthesizer output frequency to a reference frequency, and (2) the reference
loop, which phase-locks the reference frequency to the timebase. The timebase or master
reference is a highly stable 10 MHz source built into the instrument. An external source can be
easily substituted for it at the option of the user (see Figure 3-5).
Figure 3-5. The output loop
Theory of Operation
Manual No. 120AM00250, Rev C, September 1998
3-5
Содержание GT 9000
Страница 12: ...Series GT 9000 Microwave Synthesizers x Manual No 120AM00250 Rev C September 1998 ...
Страница 14: ...Series GT 9000 Microwave Synthesizers xii Manual No 120AM00250 Rev C September 1998 ...
Страница 18: ...Series GT 9000 Microwave Synthesizers xvi Manual No 120AM00250 Rev C September 1998 ...
Страница 20: ...Series GT 9000 Microwave Synthesizers xviii Manual No 120AM00250 Rev C September 1998 ...
Страница 94: ...Model GT 9000 Microwave Synthesizer 3 36 Manual No 120AM00250 Rev C September 1998 ...
Страница 122: ...Model GT 9000 Microwave Synthesizer 4 28 Manual No 120AM00250 Rev C September 1998 ...
Страница 129: ...6 Check the level control circuit see Section 5 3 7 Maintenance Manual No 120AM00250 Rev C September 1998 5 3 ...
Страница 142: ...Model GT 9000 Microwave Synthesizer 5 16 Manual No 120AM00250 Rev C September 1998 ...
Страница 198: ...Model GT 9000 Microwave Synthesizer 6 56 Manual No 120AM00250 Rev C September 1998 ...
Страница 206: ...Model GT 9000 Microwave Synthesizers 7 2 Manual No 120AM00250 Rev C September 1998 ...
Страница 232: ...Model GT 9000 Microwave Synthesizer A 26 Manual No 120AM00250 Rev C September 1998 ...
Страница 238: ...Model GT 9000 Microwave Synthesizer Index 6 Manual No 120AM00250 Rev C September 1998 ...