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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing an example of measured
values of C / N of a crystal oscillator, and FIG. 2 is a circuit diagram showing an embodiment of
the present invention. 1 is a crystal oscillation circuit, 2 is a transistor, 3 is a crystal oscillator, 4
is a band 5 filter, and 5 is a crystal oscillator. Fig. 2-105-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the reduction of
sideband noise in crystal oscillator circuits. In wireless communication, sideband noise of the
transmission wave and sideband noise of the received local oscillation output cause interference,
but the source of these sideband noises is a crystal oscillator that is the source of the carrier
wave. is there. FIG. 1 is an example of measured values of sideband noise of a crystal oscillator.
Carrier-to-sideband noise ratio (hereinafter referred to as 情 死) Fi. As is well known, in the case
of 2 frequency multiplication, the cylindrical wave of the carrier wave is far from becoming 1 of
4 · 11 (for example, i decreased by 2 in 2 multiplication, ie, 6 dB) in the evening This is
particularly a problem when the multiplication factor must be increased. The present invention
aims to provide a crystal oscillator with reduced sideband noise that causes interference. FIG. 2
shows an embodiment of the present invention, in which 1 is a crystal oscillation 1 lil path, 2 is a
transistor, and 3 is a crystal oscillator. Next, this operation tl "will be described. The crystal
oscillation circuit 1 is a known oscillation circuit mainly composed of a transistor 2 and a crystal
oscillator 3, and has a CA ratio equivalent to that of a conventionally supplied crystal oscillator,
while the band pass filter 4 is a crystal oscillator Because it includes 5 as a component, it has
narrow band (for example, 1 kHz at 3 dB reduction) characteristics, and the output of the crystal
oscillation circuit 1 passes through the band pass filter 4 and the sideband noise gives a large
attenuation amount. A large C / NO signal is introduced to the output of the band pass filter 4.
According to the present invention as described above, according to the present invention, a
crystal oscillator with a large C / N can be obtained with a very simple configuration, and if it is
used for a high-radio communication device with a # carrier frequency It is great to be able to
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description, jps5248345
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