Frequency multiplier
A frequency multiplier is a circuit for generating a high frequency clock signal. A frequency multiplier is generally used to generate an output signal having a frequency that is a multiple of an input signal's frequency. When the input signal is variable, it may also be necessary to synchronize the output signal to variations in the input signal's frequency and phase. The frequency multiplier circuit can be used in a memory, a microprocessor, a video appliance, an audio appliance, etc. During use, the frequency multiplier is connected in a chip of a clock recovery circuit. Many widely used microprocessors use an internal clock frequency multiplier to create a high speed clock from a lower speed system clock. Generally, a frequency multiplier is a harmonic conversion transducer for producing an output signal at a frequency that is an integral multiple of the fundamental frequency of the input signal. A frequency multiplier is constructed to output a signal whose frequency is a multiple of that of an input signal by utilizing the nonlinearity of the input-output characteristic of a transistor. Phase-locked loops (PLLs) are well known feedback circuits used to keep an output signal synchronized or locked with respect to variations in the input signal's frequency and phase. Phase locked loop (PLL) based clock frequency multipliers are commonly used in microprocessors for generating the main processor clock from a lower frequency clock. A frequency multiplier is used in a radio system and the like to convert an RF signal outputted from a voltage-controlled oscillator (VCO) into a frequency which is a multiple of the frequency of the RF signal. In mobile communication devices, including cellular phones, the number of transmission carrier frequency bands has been increased for effective use of frequencies. The mobile communication devices are more capable of switching between carrier frequencies according to usage than ever. Accordingly, the frequency multiplier devices are required to appropriately select among a plurality of multiplied frequencies.
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