Term	Symbol	Definition of terms (commentary)
Quartz crystal controlled oscillators		An electronic component containing an oscillation circuit with a crystal unit
简易封装晶体振荡器 (SPXO)	SPXO	Crystal controlled oscillator having no means of temperature control or compensation, exhibiting a frequency/temperature characteristic determined substantially by the quartz crystal resonator employed
电压控制晶体振荡器 (VCXO)	VCXO	Crystal controlled oscillator, the frequency of which can be deviated or modulated according to a specific relation, through application of a control voltage
温度补偿晶体振荡器 (TCXO)	TCXO	Crystal controlled oscillator whose frequency deviation due to temperature is reduced by means of a compensation system incorporated in the device
恒温控制晶体振荡器 (OCXO)	OCXO	crystal controlled oscillator in which at least the piezoelectric resonator is temperature controlled
标称频率	f_nom	Frequency given by the manufacturer or the specification to identify the filter
电源电压	V_CC,	DC voltage that is supplied to drive the oscillator
消耗电流	I_CC	Value of the current that is supplied to drive the oscillator
频率允许偏差	△f/f	Maximum permissible deviation of the oscillator frequency from a specified nominal value when operating under specified conditions
综合频率允许偏差	△f/f	Maximum permissible deviation of the working frequency of the resonator from the nominal frequency due to a specific cause or a combination of causes
储存温度范围	T_str	Minimum and maximum temperatures as measured on the enclosure at which the device may be stored without deterioration or damage to its performance
工作温度范围	T_opr	Range of temperatures over which the oscillator will function, maintaining frequency and other output signal characteristics within specified tolerances
稳定化时间		Duration, measured from the initial application of power, required for a crystal controlled oscillator to stabilize its operation within specified limits Related image
Frequency/voltage coefficient		Fractional change in output frequency resulting from an incremental change in supply voltage, other parameters remaining unchanged
Frequency/load coefficient		Fractional change in output frequency resulting from an incremental change in electrical load impedance, other parameters remaining unchanged
Long-term frequency stability		Relationship between oscillator frequency and time This is also expressed as Aging of frequency.
Short-term frequency stability		Rrandom fluctuations of the frequency of an oscillator over short periods of time
相位噪声		A frequency-range measure of the short-term frequency stability of a crystal oscillator. Expressed as the power spectral density of the phase fluctuations. Also it is described phase noise.
Linearity of frequency modulation deviation		Frequency-domain measure of the short-term frequency stability of an oscillator. This phase noise is normally expressed as the power spectral density of the phase fluctuations
Harmonic distortion		"Non-linear distortion characterized by the generation of undesired spectral components harmonically related to the desired signal frequency Each harmonic component is usually expressed as a power (in decibels) relative to the output power of the desired signal."
上升时间	tr	time interval required for the leading edge of a waveform to change between two defined levels Related image
下降时间	tf	time interval required for the falling edge of a waveform to change between two defined levels Related image
波形对称性		Ratio between the time (t1), in which the output voltage is above a specified level, and the time (t2), in which the output voltage is below the specified level, in percent of the duration of the full signal period Related image
High level output voltage	V_OH	High level side of output frequency. It is sometimes showed VOH
Low level output voltage	V_OL	Low voltage side of output frequency.It is sometimes showed VOL.
Start-up time	tsu	Duration of time measured from the instant of application of power to the instant at which the crystal oscillator outputs the specified level of signal in agreement with the specified conditions Related image
相位抖动		Short-term variations of the zero crossings of the oscillator output signal from their ideal position in time
待机功能		A function to stop oscillation by an external control voltage to the oscillator. (Oscillation of the crystal unit is stopped.) Related image
Enable/disable function		A function to stop only the output without stopping the oscillation of the crystal unit by an external control voltage to the oscillator. Related image
Three-state output		Output stage which may be enabled or disabled by the application of an input control signal In the disabled mode the output impedance of the gate is set to a high level permitting the application of test signals to the following stages.
Disable current		Value of the consumed current at which, by an application of external control voltage, the output is disabled while the oscillation of the crystal oscillator is maintained
Stand-by current		The current consumption when the crystal oscillator has been stopped oscillating by means of a control voltage applied externally
Output load condition		A load condition that can be driven by the output of an oscillator. The load as seen from the output end of the oscillator, including resistance and capacitance. Sometimes also described as load impedance.
Frequency/temperature characteristics	△f/f	Deviation of frequency from the referential frequency over the operating temperature range, while other conditions are kept constant
Frequency temperature slope		The amount of frequency change relative to a specified temperature range
Hysteresis		The amount of frequency change at the same temperature when an oscillator is subjected to a round-trip temperature change.
Output voltage		Amplitude of output waveform. Related image
Frequency control range		Range of the variance of output frequency controlled by applying an external voltage
Absolute pull range		Minimum guaranteed range of output frequency changes from the nominal frequency by an external control voltage under a specified condition or a combination of conditions
Control voltage	V_cont	Input voltage applied to the frequency control terminal for controlling the output frequency
Frequency change polarity		Direction of the frequency change when it is raised the control voltage
Frequency control sensitivity		The amount of frequency variation by defining controlled voltage.
Maximum rating		The voltage, current, temperature, and power consumption that must not be exceeded for even a moment. Sometimes described as absolute maximum ratings.
Input Impedance		The impedance presented by a filter to the signal source when terminated by a specified load impedance
Holdover		Function to maintain the original frequency when the lock is released.