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US 5,204,552 AGranted
Voltage controlled oscillator and an operating method thereof
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTsutomu Miki
Life of this patent
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Abstract
Frequency data representing frequencies are stored in a memory in advance. An A/D converter converts an input signal V to a digital data. Addressing of the memory is carried out by using the digital data, and a frequency data is read out from a designated address. A count circuit counts prescribed clock pulses to provide a count data. A comparator compares the frequency data with the count data to provide the signal indicating comparison result, so that the counter circuit is reset.
Claims18
A voltage controlled oscillator, comprising:
- analog to digital converting means for converting an input voltage to a digital signal;
- storage means for storing in advance frequency data corresponding to frequencies in respective addresses, receiving said digital signal, and reading out a frequency data from an address designated by said digital signal;
- clock pulse generating means for generating clock pulses;
- counting means for counting said clock pulses generated from said clock pulse generating means to provide a count data indicating count value;
- and
- comparing means for comparing the frequency data read out from said storage means with the count data provided from said counting means, to provide a signal indicating comparison result, and to reset said counting means when said frequency data coincides with said count data.
3 more elements
The voltage controlled oscillator according to claim 18, wherein said comparing means further comprises:
- NOR gate means for receiving outputs of said plurality of exclusive OR gate means.
An operating method for a voltage controlled oscillator comprising the steps of:
- storing in advance at a plurality of addresses of a digital memory a plurality of frequency data corresponding to a plurality of frequencies;
- converting an external analog input signal to a digital signal;
- inputting said digital signal to said digital memory and reading out said frequency data at an address location corresponding to said digital signal;
- generating clock pulses;
- counting said generating clock pulses to generate a count data indicating count value;
- and
- comparing said read out frequency data with said generated count data to provide a signal indicating comparison result, and to reset said counting when said read out frequency coincides with said generated count data.
4 more elements
A method of converting an analog signal to an output signal having a variable frequency corresponding to said analog signal, comprising the steps of:
- converting said analog signal to a digital control signal;
- prestoring in a memory a plurality of data corresponding to a plurality of frequencies;
- reading out any one of said stored plurality of said frequency data from said memory in response to said digital control signal;
- generating clock pulses;
- counting said clock pulses to generate count data indicative of a count value;
- comparing said read out frequency data with said count data to provide a signal indicating a comparison result;
- resetting said count value when said frequency data read out during the preceding step coincides with said count value;
- varying said prestored plurality of data;
- and
- supplying said comparison result as said output signal.
7 more elements
A voltage controlled oscillator, comprising:
- an analog-to-digital converter for converting an input voltage to a digital signal;
- storage means for prestoring in storage locations corresponding to respective addresses frequency data corresponding to frequencies and for reading out frequency data corresponding to frequencies and for reading out frequency data from an address designated by said digital signal;
- a clock pulse generator for generating clock pulses;
- a counter for counting said clock pulses generated from said clock pulse generating means to provide a count data indicating count value;
- means for supplying address frequency data to said storage means and for changing said address frequency data;
- and
- a comparator for comparing the frequency data read out from said storage means with the count data provided from said counting means, to provide a signal indicating a comparison result, and to reset said counting means when said frequency data coincides with said count data.
4 more elements
A voltage controlled oscillator, comprising:
- analog to digital converting means for converting an input voltage to a digital signal;
- storage means for storing a plurality of frequency information receiving said digital signal, and in response thereto, outputting corresponding stored frequency information from among said plurality of frequency information;
- counting means for counting clock pulses and generating count information;
- and
- means for generating an output signal based upon said frequency information from said storage means and said count information to provide a signal indication comparison result, and to reset said counting means when said frequency information coincides with said count information.
2 more elements
A voltage controlled oscillator, comprising:
- analog to digital converting means for converting an input voltage to a digital signal;
- storage means for storing in advance frequency data corresponding to frequencies in respective addresses, receiving said digital signal, and reading out a frequency data from an address designated by said digital signal;
- clock pulse generating means for generating clock pulses;
- counting means for counting said clock pulses generated from said clock pulse generating means to provide a count data indicating count value;
- and
- comparing means for comparing the frequency data read out from said storage means with the count data provided from said counting means, to provide a signal indicating comparison result, and to reset said counting means when said frequency data coincides with said count data, wherein
- each of said frequency data has a plurality of bits, and each of said count data has the same plurality of bits as that of said frequency data, and
- said comparing means includes;
- a plurality of exclusive OR gate means each receiving a corresponding bit of said frequency data and a corresponding bit of said count data.
6 more elements
Dependencies are inferred from the claim text.