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Nexxim Simulator >
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Lumped Elements General >
Crystal, Q, Series Resonance (CRYQS)

Crystal, Q, Series Resonance (CRYQS)

Netlist Form

An instance of an crystal , Q specified, series resonance, has the following Nexxim netlist syntax:

Axxx n1 n2 C=val FS=val [Q=val] [CO=val] [TC=val]
[MODE=val] [TEMP=val] [F1=val] [F2=val] COMPONENT=crystalqs

n1 and n2 are the nodes connected to the crystal. The entry COMPONENT=crystalqs identifies the element.

**Crystal, Q, Series Resonance Instance Parameters**
Parameter	Description	Units	Default
C	Motional capacitance	Farad	0.0
FS	Series overtone frequency	Hz	0.0
CO	Static capacitance	Farad	0.0
Q	Quality factor at resonant frequency FS	None	0.0
MODE	Overtone (odd number)	None	1
TC	Temperature coeffficient in PPM	None	0.0
TEMP	Device temperature	Celsius	25.0
F1	Lower resonant frequency limit	Hz	10
F2	Upper resonant frequency limit	Hz	1e12

Netlist Example

Acryqs1 1 2 C=0.3e-12 Q=132000 FS=273.75e6 MODE=3 TC=50
+ TEMP=50 COMPONENT=crystalqs

Notes

1. ESR is the equivalent series resistance for the crystal and can be calculated from Q factor (specified at resonant frequency FS) and the motional capacitance C as

ESR=1.0/(2π∗FS*Q*C).

2. L is the crystal’s motional inductance and can be calculated from motional capacitance C and resonant frequency FS.

3. F1 and F2 specify the frequency range for crystal device. The motional capacitance and the Q of the crystal will fall in the manufacture specified value in this frequency range.

4. TC is defined in PPM (parts per million). For example, a crystal has nominal value of FS at 298 K. At temperature TEMP, the resulting value of the series-self resonance frequency, F_s, is calculated as
F_s = FS*[1+(TEMP-298)*TC*1.0e-6]

5. MODE is used to specify the crystal’s overtone mode and must be an odd positive integer. Setting MODE to a value greater than 1 results in series self-resonances at FS and at FS/MODE. For example, setting FS equal to 222MHz and MODE equal to 5 results in series resonances at 222 MHz (the fifth-overtone resonance) and 222/5 MHz, or 44.4 MHz (the fundamental resonance).

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