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US 6,052,571 AGranted
Tuner for PSK or PAM data applications
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAkira Mishima, Shigeharu Sumi, Motoyoshi Kitagawa
Life of this patent
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Abstract
A high frequency apparatus for receiving digitally modulated high frequency signals withstands vibration and has a simple tuning adjustment. The apparatus has an input terminal, a mixer which mixes the input signals and an output signal from a local oscillator, a voltage controlled oscillator which includes the local oscillator, an oscillating section, a movable conductive member and, a gluing agent for maintaining an adjusted state, and a control loop having a high loop band width which is large enough so that noise of the local oscillator is not dominated by noise of the voltage controlled oscillator.
Claims113
A high frequency apparatus for use with a signal, said apparatus comprising:
- a mixer having:
- i) a first input coupled to the signal and,
- ii) a second input coupled to an output of a local oscillator, and
- iii) an output terminal coupled to an output signal of said mixer;
- said local oscillator includes:
- i) a voltage controlled oscillator, having
- a) an oscillating section, and
- b) a tuning section including a frequency adjustment section for adjusting a frequency of the voltage controlled oscillator, and
- c) maintaining means for maintaining the frequency of the voltage controlled oscillator after adjustment of the frequency,
- ii) a frequency divider,
- iii) a phase comparator, and
- iv) a loop filter,
- wherein said frequency divider, said phase comparator and said loop filter are part of a control loop;
- said control loop having a loop band width such that a noise effect of said local oscillator are not dominated by said voltage controlled oscillator.
- and a signal level of the reference frequency signal supplied to said phase comparator is lower than a signal level of a further frequency signal supplied from said frequency divider to said phase comparator within a respective frequency region including a predetermined region above and below the center frequency.
12 more elements
A high frequency apparatus for use with an input signal, said apparatus comprising:
- a mixer having
- i) a first input coupled to the input signal,
- ii) a second input coupled to an output of a local oscillator, and
- iii) an output terminal coupled to an output signal of the mixer;
- said local oscillator having
- i) a voltage controlled oscillator including
- a) an oscillating section, and
- b) a tuning section including a frequency adjusting section for adjusting a frequency of the voltage controlled oscillator, and
- means for maintaining the frequency of the voltage controlled oscillator after adjustment,
- ii) generating means for generating a reference frequency signal, said reference signal having a reference center frequency,
- iii) a phase comparator coupled to said reference frequency signal,
- iv) a frequency divider generating a second frequency signal, and
- v) a loop filter,
- wherein said generating means for generating said reference frequency signal, said phase comparator, said frequency divider, and said loop filter are part of a control loop;
- said control loop having a loop band width such that a noise effect of said local oscillator are not dominated by said voltage controlled oscillator, and a signal level of the reference frequency signal supplied from said frequency divider to said phase comparator is lower than a signal level of a further frequency signal supplied to said phase comparator within a respective frequency region including a predetermined region above and below the center frequency.
12 more elements
A high frequency apparatus for use with an input signal, said apparatus having a center frequency and comprising:
- a mixer having
- i) a first input coupled to the input signals,
- ii) a second input coupled to an output of a local oscillator, and
- iii) an output terminal coupled to an output signal of the mixer;
- said local oscillator including
- i) a voltage controlled oscillator having,
- a) an oscillating section,
- b) a tuning section including a frequency adjusting section for adjusting a frequency of the voltage controlled oscillator, and
- means for maintaining the frequency of the voltage controlled oscillator after adjustment,
- ii) generating means for generating a reference frequency signal said reference signal having a reference center frequency,
- iii) a phase comparator receiving said reference frequency signal,
- iv) a frequency divider, and
- v) a loop filter,
- wherein said generating means for generating said reference frequency signal, said phase comparator, said frequency divider, and said loop filter are part of a control loop,
- said control loop having a loop band width such that a noise effect of said local oscillator is not dominated by said voltage controlled oscillator, a signal level of a frequency distribution characteristic within a predetermined region of the reference center frequency is lower, relative to the signal level of a frequency distribution characteristic within a predetermined region of a center frequency of the output signal from said local oscillator, than a signal level to be noise-reduced by the high loop band width in a same off-set frequency from the respective center frequency excluding a portion substantially at the center frequency of the high frequency apparatus.
12 more elements
A high frequency apparatus for use with an input signal, said apparatus comprising:
- a mixer having
- i) a first input coupled to the input signal,
- ii) a second input coupled to an output of a local oscillator, and
- iii) an output terminal coupled to an output signal of the mixer;
- said local oscillator includes
- i) a voltage controlled oscillator having
- a) an oscillating section, and
- b) a pattern inductance line formed on a substrate,
- ii) generating means for generating a reference frequency signal, said reference signal having a reference center frequency,
- iii) a phase comparator,
- iv) a frequency divider and
- v) a loop filter,
- wherein said generating means for generating said reference frequency signal, said phase comparator, said frequency divider, and said loop filter are part of a control loop,
- said control loop having a sufficiently high loop band width such that noise effects of said local oscillator are not dominated by said voltage controlled oscillator, and signal level of the reference frequency signal supplied to said phase comparator is lower than a signal level of a further frequency signal supplied from said frequency divider to said phase comparator within a respective frequency region including a predetermined region above and below the center frequency.
11 more elements
A high frequency apparatus for use with an input signal, said apparatus having a center frequency and comprising:
- a mixer having
- i) a first input coupled to the input signal,
- ii) a second input coupled to an output signal of a local oscillator, and
- iii) an output terminal coupled to an output signal of the mixer;
- said local oscillator includes
- i) a voltage controlled oscillator having
- a) an oscillating section, and
- b) a pattern inductance line formed on a substrate,
- ii) generating means for generating a reference frequency signal, said reference signal having a reference center frequency,
- iii) a phase comparator,
- iv) a frequency divider, and
- v) a loop after,
- wherein said generating means for generating said reference frequency signal, said phase comparator, said frequency divider, and said loop filter are part of a control loop,
- said control loop having a sufficiently high loop band width such that noise effects of said local oscillator are not dominated by said voltage controlled oscillator, a signal level of a frequency distribution characteristic within a predetermined region of the reference center frequency is lower, relative to a signal level of a frequency distribution characteristic within a predetermined region of a center frequency of the output signal from said local oscillator, than a signal level to be noise-reduced by the high loop band width in a same off set frequency from the respective center frequency excluding a portion substantially at the center frequency of the high frequency apparatus.
11 more elements
Dependencies are inferred from the claim text.