Frequency Generator
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorTomas Nylén
Life of this patent
Estimating the term…
Abstract
A frequency generator comprising an oscillator that generates I and Q signals and a prescaler with a clock phase generator that uses the I and Q signals as input and can generate a predetermined number of phases, a switch bank with a number of switches corresponding to the number of phases that can be generated by the clock phase generator, and a clock select logic component. The prescaler comprises a state machine that can assume a predetermined number of states as output. The output state is input to the clock select logic component and determines which switch to use as output from the switch bank and as “clock” input to the state machine, with one of the outputs of the state machine being a signal fout with a desired frequency.
Claims15
A frequency generator (100, 500) comprising an oscillator (110, 510) which is adapted to generate a signal output at a first frequency, the frequency generator (100, 500) being characterized in that it also comprises a prescaler (120, 520) which uses the output signal from the oscillator (110, 510) as its input signal and scales the frequency of the input signal by a predetermined factor, by means of which an output signal (fout) from the frequency generator (100, 500) is created at a second frequency which differs from the first frequency of the output signal from the oscillator by a predetermined factor.
The frequency generator (100) of any of claims 9-15, in which the assumed state at the output of the state machine (123) is used to determine which switch (S0-S7) in the switch bank (122) will be activated to be used as the output from the switch bank by means of using the output from the state machine (123) as input to a clock select logic component (124) which is controlled to produce the number or address of a certain one of the switches in the switch bank for each input state.
Dependencies are inferred from the claim text.