US 9,432,029 B2Granted

Frequency modulation circuit and semiconductor device

AssigneeLapis Semiconductor Co., Ltd.

InventorOsamu Takeda

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Abstract

A frequency modulation circuit includes a calibration-operating part which calculates primary calibration values of modulation index at central frequencies of respective ones of n pieces of TF bands which constitute the entire TF range. Interpolation-calculation part performs an interpolation-calculation with respect to the n pieces of primary calibration values and calculates calibration values at intermediate frequencies of central frequencies of neighboring ones of TF bands while calculating calibration values at frequencies at both ends of entire TF range to obtain (n+1) pieces of interpolated calibration values as secondary calibration values. Calibration value supply part supplies one calibration value corresponding to the TF bands set in the TF band setting part from among the primary calibration values or secondary calibration values to a modulation part performing frequency modulation together with calculation based on the supplied calibration value.

Claims10

Dependent claims

A frequency modulation circuit comprising:

a modulation part for performing a frequency modulation with an input data signal while calibrating a modulation index based on a calibration value;
a transmission frequency band setting part for selecting and setting a transmission frequency band in accordance with a given channel selection signal within an entire transmission frequency range;
and
a calibration-operating part for calculating, on the basis of said input signal, primary calibration values of the modulation index at the central frequencies of respective ones of n (where the n denotes an integer of 2 or more) pieces of transmission frequency bands which constitute said entire transmission frequency range, further comprising;
an interpolation-calculation part for performing an interpolation-calculation with respect to said n pieces of said primary calibration values and calculating calibration values at intermediate frequencies of the central frequencies of neighboring ones of the transmission frequency bands while calculating calibration values at frequencies at both ends of said entire transmission frequency range to obtain (n+1) pieces of interpolated calibration values as secondary calibration values;
and
a calibration value supply part for selecting one calibration value corresponding to the transmission frequency bands set in said transmission frequency band setting part from among said n pieces of the primary calibration values or (n+1) pieces of the secondary calibration values, and supplying the selected calibration value to said modulation part.

4 more elements

A semiconductor device comprising a frequency modulation circuit for performing a frequency modulation with an input data to output an output signal,

said frequency modulation circuit comprising:
a modulation part for performing a frequency modulation with an input data signal while calibrating a modulation index based on a calibration value;
a transmission frequency band setting part for selecting and setting a transmission frequency band in accordance with a given channel selection signal within an entire transmission frequency range;
and
a calibration-operating part for calculating, on the basis of said input signal, primary calibration values of the modulation index at the central frequencies of respective ones of n (where the n denotes an integer of 2 or more) pieces of transmission frequency bands which constitute said entire transmission frequency range,
said frequency modulation circuit further comprising;
an interpolation-calculation part for performing an interpolation-calculation with respect to said n pieces of said primary calibration values and calculating calibration values at intermediate frequencies of the central frequencies of neighboring ones of the transmission frequency bands while calculating calibration values at frequencies at both ends of said entire transmission frequency range to obtain (n+1) pieces of interpolated calibration values as secondary calibration values;
and
a calibration value supply part for selecting one calibration value corresponding to the transmission frequency bands set in said transmission frequency band setting part from among said n pieces of the primary calibration values or (n+1) pieces of the secondary calibration values, and supplying the selected calibration value to said modulation part.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/977,729Filed 22 Dec 2015
Priority: JP 2014-26113624 Dec 2014
Published: US 2016/0191064 A130 Jun 2016
Granted: 30 Aug 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H03L 7/085
Details of the phase-locked loop: concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its…
H03C 3/0925
With frequency divider or counter in the loop: applying frequency modulation at the divider in the feedback loop
H03C 3/0941
Using a phase locked loop: applying frequency modulation at more than one point in the loop
H03C 3/0958
Using a phase locked loop: applying frequency modulation by varying the characteristics of the voltage controlled oscillator