Multiple oscillator device having plural quartz resonators in a common quartz substrate
First Claim
1. A multiple oscillator device, comprising:
- a crystal substrate;
a plurality of oscillators including;
a first oscillator including an AT-cut first crystal resonator having a resonant frequency, and a first oscillation control circuit for controlling the oscillation output of said first oscillator, said first oscillation control circuit including means for receiving a first control signal indicating the value of a first parameter to be sensed and modulating said first oscillator output in accordance with said first control signal; and
a second oscillator including a AT-cut second crystal resonator formed in said substrate at the same time as said first crystal resonator and having a resonant frequency, and a second oscillation control circuit for controlling the oscillation output of said second oscillator, said second oscillation control circuit controlling said output of said second oscillator independently of the value of said first parameter to be sensed;
signal processing means for processing outputs from said oscillators to obtain a desired output signal; and
isolation means disposed between adjacent resonators for decreasing the capability of said substrate to propagate frequencies in a range which includes the resonant frequencies of said resonators while maintaining common structural support of all of said resonators by said substrate.
2 Assignments
0 Petitions
Accused Products
Abstract
A system is described which comprises many quartz resonators, all formed on the same quartz substrate. The method of fabrication ensures that all the resonators are mechanically and electrically isolated from each other. The oscillation frequencies of the resonators may be individually adjusted to different desired values during fabrication. Since the deviation from the optimum angle of cut is the same for all the resonators because they are all on the same substrate, all the resonators have the same temperature coefficient (change of frequency per degree change in temperature). Mounting the electronic circuitry on the quartz substrate simplifies the interconnections between the resonators and the circuitry, and reduces the size of the resulting device.
-
Citations
14 Claims
-
1. A multiple oscillator device, comprising:
-
a crystal substrate; a plurality of oscillators including;
a first oscillator including an AT-cut first crystal resonator having a resonant frequency, and a first oscillation control circuit for controlling the oscillation output of said first oscillator, said first oscillation control circuit including means for receiving a first control signal indicating the value of a first parameter to be sensed and modulating said first oscillator output in accordance with said first control signal; and
a second oscillator including a AT-cut second crystal resonator formed in said substrate at the same time as said first crystal resonator and having a resonant frequency, and a second oscillation control circuit for controlling the oscillation output of said second oscillator, said second oscillation control circuit controlling said output of said second oscillator independently of the value of said first parameter to be sensed;signal processing means for processing outputs from said oscillators to obtain a desired output signal; and isolation means disposed between adjacent resonators for decreasing the capability of said substrate to propagate frequencies in a range which includes the resonant frequencies of said resonators while maintaining common structural support of all of said resonators by said substrate. - View Dependent Claims (2, 3)
-
-
4. A multiple oscillator device, comprising:
-
a crystal substrate; a plurality of crystal oscillators each providing an output, said plurality of crystal oscillators comprising;
a first oscillator including an AT-cut crystal resonator coated with an RF absorption material sensitive to RF level, said first oscillator having a resonant frequency; and
a second oscillator having an AT-cut crystal resonant having a resonant frequency and formed in the substrate at the same time as said first resonator, said second oscillator oscillating at a frequency independent of said RF level, whereby the value of said RF level can be detected by comparing the outputs of said first and second oscillators;signal processing means for processing outputs from said oscillators to obtain a desired output signal; and isolation means disposed between adjacent resonators for decreasing the capability of said substrate to propagate frequencies in a range which includes the resonant frequencies of said resonators while maintaining common structural support of all of said resonators by said substrate.
-
-
5. A multiple oscillator device of the type comprising a crystal substrate, a plurality of crystal oscillators each providing an output and signal processing means for processing outputs from said oscillators to obtain a desired output signal, each of said oscillators including a respective crystal resonator having a respective resonant frequency, the crystal resonators of said plurality of oscillators each being formed at the same time in said substrate, said device including isolation means in the form of a gap in said substrate between adjacent resonators for decreasing the capability of said substrate to propagate frequencies in a range which includes the resonant frequencies of said resonators while maintaining common structural support of all of said resonators by said substrate.
- 6. A multiple oscillator device of the type comprising a crystal substrate, a plurality of crystal oscillators each providing an output and signal processing means for processing outputs from said oscillators to obtain a desired output signal, each of said oscillators including a respective crystal resonator having a respective resonant frequency, the crystal resonators of said plurality of oscillators each being formed at the same time in said substrate, said device including isolation means disposed between adjacent resonators for decreasing the capability of said substrate to propagate frequencies in a range which includes the resonant frequencies of said resonators while maintaining common structural support of all of said resonators by said substrate, said isolation means comprising a region where at least a substantial portion of said substrate has been removed.
Specification