What is a Dctcxo?
Digitally Controlled Temperature Compensated Crystal Oscillator (DCTCXO) or Digitally. Controlled Temperature Compensated Oscillator. A DCTCXO is a TCXO that incorporates the frequency pulling and programming functionality of a DCXO.
Is duty cycle the same as symmetry?
Symmetry is also commonly referred to as Duty Cycle, and is the measure of output wave uniformity (or symmetry). Symmetry is a measurement of the time that the output waveform is in a logic high state, expressed as a percent age (%) of the complete cycle.
What is oscillator symmetry?
Oscillator symmetry refers to the ratio between the time taken for a full cycle and that taken for a half cycle. For TTL output level oscillators these values are measured at +1.4 Volt, and at ½ VDD level for CMOS, HCMOS and Universal oscillator outputs.
What is the range of an oscillator?
An audio oscillator produces frequencies in the audio range, about 16 Hz to 20 kHz. An RF oscillator produces signals in the radio frequency (RF) range of about 100 kHz to 100 GHz.
What is meant by TRC and duty cycle?
In this control scheme, time ratio Ton/T (duty ratio) is varied. This is realized by two different ways called Constant Frequency System and Variable Frequency System as described below: Time Ratio Control (TRC) In this control scheme, time ratio Ton/T (duty ratio) is varied.
What is duty chopper cycle?
Answer: The total time period of one cycle of output waveform is constant. The average output voltage is directly proportional to the ON time of chopper. The ratio of ON time to total time is defined as duty cycle. It can be varied between 0 and 1 orbetween 0 and 100%.
What is the oscillator output?
Sine Wave – is the standard or ‘natural’ signal output of a crystal or oscillator circuit. It consists of one fundamental sinusoidal frequency output. The linearity sine wave outputs offer the best phase noise performance of all the outputs. These are great for applications that require a high-quality output signal.
What is oscillator transducer?
An oscillator transducer is a type of transducer that can be used to measure force, pressure, or displacement by converting it a voltage, which can then be measured by a voltmeter. Oscillator transducer are mostly used as secondary transducers, with their output calibrated in terms of their input quantity.
What type of feedback is used in oscillators?
Positive feedback
Positive feedback increases gain of the amplifier also increases distortion, noise and instability. Because of these disadvantages, positive feedback is seldom employed in amplifiers. But the positive feedback is used in oscillators.
What are the two most popular RF oscillators?
There are two main types of oscillator: linear or harmonic oscillator, nonlinear or relaxation oscillator. The harmonic oscillators are generally used in the clocks and radio circuits because they have simple harmonic sine waves.
What is PWM duty cycle?
PWM Characteristics Duty cycle: A duty cycle is the fraction of one period when a system or signal is active. We typically express a duty cycle as a ratio or percentage. A period is the time it takes for a signal to conclude a full ON-OFF cycle.
What are the two types of TRC?
There are two kinds of control strategies used in DC choppers namely time ratio control and current limit control.
What is TCXO solution?
TCXO solution. A TCXO adjusts the frequency of the oscillator to compensate for the changes that will occur as a result of temperature changes. To achieve this, the main element within a TCXO is a Voltage Controlled Crystal Oscillator (VCXO).
How to choose the right TCXO?
Voltage regulator: In order to prevent external voltage changes from introducing unwanted frequency shifts, the overall TCXO should incorporate a voltage regulator which itself should not introduce unwanted temperature effects. In addition to this, the output from the voltage regulator should be very low noise.
What is a TCXO oscillator?
A TCXO is a temperature-compensated crystal oscillator that is used whenever particularly high stability within a variant temperature environment is required, i.e. when the frequency deviation of the oscillator must be minimal over its entire operating temperature range.
What is the difference between an OCXO and a VCXO?
By measuring the temperature and applying a correction voltage to a VCXO, the frequency stability over a temperature range is considerably improved whilst keeping costs low – using an oven controlled crystal oscillator, OCXO would be considerably more costly and much larger in size.