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   Crystal, ESR, Parallel Resonance (CRYRP)       

Crystal, ESR, Parallel Resonance (CRYRP)

 

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Properties

Description

Unit

Default

Range

C

Nominal capacitance

Capacitance

Required

[0,INF)

FP

Parallel overtone frequency

Frequency

0.0

[0,inf)

CO

Static capacitance

Capacitance

0.0

[0,INF)

CL

Load capacitance

Capacitance

0.0

[0,INF)

ESR

Equivalent series resistance

Resistance

0.0

[0,INF)

MODE

Overtone

None

1.0

[0,INF)

TC

Temperature coefficient in PPM

None

0.0

[0,INF)

TEMP

Element temperature

Temperature

-1

[0,inf)

F1

Lower resonant frequency limit for crystal

Frequency

10

[0,inf)

F2

Upper resonant frequency limit for crystal

Frequency

1.e12

[0,inf)

MOD

Name of the crystal in a related device library

None

 

 

Notes

1. ESR is the equivalent series resistance for the crystal.

2. L is the crystal’s nominal inductance and can be calculated from nominal capacitance C and series-resonance frequency FS.

3. F1 and F2 specify the frequency range for crystal device. The nominal capacitance and 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, Fs, is calculated as
Fs = FS*[1+(TEMP-298)*TC*1.0e-

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).

6. The load capacitance, CL, is an external capacitance that sets a point on the reactance curve at which the crystal will resonate. CL comprises a combination of the circuit’s discrete load capacitance, stray board capacitance, and capacitance from the operation of the Miller effect in active devices. When an oscillator presents some amount of load capacitance to a crystal, the crystal is said to be parallel-resonant, and a value of load capacitance, CL, must be specified. If the circuit does not exhibit capacitive loading, the crystal is said to be series-resonant, and no value of load capacitance is specified. A quartz crystal’s parallel-resonance operating fre­quency is based on:

where FS is the series-resonance frequency, FL is the parallel-resonance frequency, CL is the crys­tal load capacitance, CO is the crystal shunt capacitance, and C is the crystal nominal capacitance.

Netlist Form

CRYRP:Name n1 [n2] C=val FS=val [ESR=val] [CO=val] [CL=val] [TC=val]
[MODE=val] [TEMP=val] [F1=val] [F2=val] [MOD=ref_label]

Netlist Example

CRYRP:1 1 2 C=0.3ff ESR=42 FS=273.75MHz MODE=3 TC=50 TEMP=300



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