Synthesizer and reception device and electronic device using the same
View Patent ↗A synthesizer includes: a synthesizer unit that outputs an oscillation signal based on a reference oscillation signal; a temperature detecting unit that detects a temperature; a time variation detecting unit that detects a time variation in frequency of the reference oscillation signal based on a result of temperature detection by the temperature detecting unit; and a control unit that adjusts a frequency of the oscillation signal outputted from the synthesizer unit based on a result of detection by the time variation detecting unit. With such a configuration, frequency compensation control is performed on a transducer having a large temperature coefficient.
1. A receiving device, comprising:
a frequency converter that converts a received signal to a frequency;
a reference oscillator that outputs a reference oscillation signal;
a synthesizer unit that supplies the frequency converter with an oscillation signal based on the reference oscillation signal outputted from the reference oscillator;
a temperature detecting unit that detects a temperature;
a time variation detecting unit that detects a time variation in frequency of the reference oscillation signal based on a result of temperature detection by the temperature detecting unit; and
a control unit that adjusts a frequency of the oscillation signal outputted from the synthesizer unit based on a result of detection by the time variation detecting unit, wherein
the reference oscillator is provided with a MEMS transducer.
2. Electronic equipment, comprising:
a receiving device according to claim 1 ;
a signal processing unit that is connected to an output side of the frequency converter; and
a display unit that is connected to an output side of the signal processing unit.
3. A receiving device, comprising:
a frequency converter that converts a received signal to a frequency;
a reference oscillator that outputs a reference oscillation signal;
a synthesizer unit that supplies the frequency converter with an oscillation signal based on the reference oscillation signal outputted from the reference oscillator;
a time variation detecting unit that detects a time variation in frequency of the reference oscillation signal based on an output signal of the frequency converter; and
a control unit that adjusts a frequency of the oscillation signal outputted from the synthesizer unit based on a result of detection by the time variation detecting unit, wherein
the reference oscillator is provided with a MEMS transducer.
4. The receiving device according to claim 3 , wherein
the time variation detecting unit detects a time variation in frequency of the reference oscillation signal based on a reference symbol included in an output signal of the frequency converter.
5. The receiving device according to claim 3 , wherein
the time variation detecting unit detects a time variation in frequency of the reference oscillation signal based on a guard interval signal included in an output signal of the frequency converter.
6. Electronic equipment, comprising:
a receiving device according to claim 3 ;
a signal processing unit that is connected to an output side of the frequency converter; and
a display unit that is connected to an output side of the signal processing unit.
7. Electronic equipment, comprising:
a receiving device including
a frequency converter that converts a received signal to a frequency,
a reference oscillator that outputs a reference oscillation signal,
a synthesizer unit that supplies the frequency converter with an oscillation signal based on the reference oscillation signal outputted from the reference oscillator,
a temperature detecting unit that detects a temperature,
a time variation detecting unit that detects a time variation in frequency of the reference oscillation signal based on a result of temperature detection by the temperature detecting unit, and
a control unit that adjusts a frequency of the oscillation signal outputted from the synthesizer unit based on a result of detection by the time variation detecting unit;
a signal processing unit that is connected to an output side of the frequency converter; and
a display unit that is connected to an output side of the signal processing unit.
8. A receiving device, comprising:
a frequency converter that converts a received signal to a frequency;
a reference oscillator that outputs a reference oscillation signal;
a synthesizer unit that supplies the frequency converter with an oscillation signal based on the reference oscillation signal outputted from the reference oscillator;
a time variation detecting unit that detects a time variation in frequency of the reference oscillation signal based on an output signal of the frequency converter; and
a control unit that adjusts a frequency of the oscillation signal outputted from the synthesizer unit based on a result of detection by the time variation detecting unit, wherein
the time variation detecting unit detects a time variation in frequency of the reference oscillation signal based on a reference symbol included in an output signal of the frequency converter.
9. A receiving device, comprising:
a frequency converter that converts a received signal to a frequency;
a reference oscillator that outputs a reference oscillation signal;
a synthesizer unit that supplies the frequency converter with an oscillation signal based on the reference oscillation signal outputted from the reference oscillator;
a time variation detecting unit that detects a time variation in frequency of the reference oscillation signal based on an output signal of the frequency converter; and
a control unit that adjusts a frequency of the oscillation signal outputted from the synthesizer unit based on a result of detection by the time variation detecting unit, wherein
the time variation detecting unit detects a time variation in frequency of the reference oscillation signal based on a guard interval signal included in an output signal of the frequency converter.
10. Electronic equipment, comprising:
a receiving device including
a frequency converter that converts a received signal to a frequency,
a reference oscillator that outputs a reference oscillation signal,
a synthesizer unit that supplies the frequency converter with an oscillation signal based on the reference oscillation signal outputted from the reference oscillator,
a time variation detecting unit that detects a time variation in frequency of the reference oscillation signal based on an output signal of the frequency converter, and
a control unit that adjusts a frequency of the oscillation signal outputted from the synthesizer unit based on a result of detection by the time variation detecting unit;
a signal processing unit that is connected to an output side of the frequency converter; and
a display unit that is connected to an output side of the signal processing unit.