ELECTRICAL RESONATOR DEVICE WITH A WIDE FREQUENCY VARIATION RANGE

• US 20110018649A1
• Filed: 01/16/2009
• Published: 01/27/2011
• Est. Priority Date: 01/18/2008
• Status: Abandoned Application

• Current Assignee: Commissariat a L'Energie Atomique (French Alternative Energies and Atomic Energy Commission)
• Original Assignee: Commissar A L'Energ ATOM et AUX Energ Altern
• Inventors: Vincent, Pierre, David, Jean-Baptiste
• Application Number:
  US12/812,559
• Publication Number:
  US 20110018649A1
• Time in Patent Office: Days
• US Class Current: 331/158
• CPC Class Codes: H03B 2200/0058 with particular transconductance characteristics, e.g. an operational transconductance amplifier
• CPC Class Codes: H03B 5/1215 the current source or degeneration circuit being in common to both transistors of the pair, e.g. a cross-coupled long-tailed pair
• CPC Class Codes: H03B 5/1228 the amplifier comprising one or more field effect transistors
• CPC Class Codes: H03B 5/1243 the means comprising voltage variable capacitance diodes
• CPC Class Codes: H03B 5/326 the resonator being an acoustic wave device, e.g. SAW or BAW device
• CPC Class Codes: H03B 5/364 the amplifier comprising field effect transistors H03B5/366 takes precedence
• CPC Class Codes: H03B 5/366 and comprising means for varying the frequency by a variable voltage or current
• CPC Class Codes: H03B 5/368 the means being voltage variable capacitance diodes

Abstract

An electrical resonator device, capable of operating at variable frequency ω, including: an acoustic wave resonator, a first electrical circuit coupled in parallel to the resonator with an adjustable complex impedance whose imaginary part is equal to

$\frac{-j}{C_1\omega },$

where C₁≧0, a second electrical circuit coupled in parallel to the resonator and the first electrical circuit, with a complex impedance whose imaginary part is equal to

$\frac{-j}{C_2\omega },$

where C₂<0, ω is the operating frequency of the device.

Claims

1. Electrical resonator device, capable of operating at variable frequency ω

, comprising at;

an acoustic wave resonator,

a first electrical circuit coupled in parallel to the resonator with an adjustable complex impedance whose imaginary part is equal to

2. The device of claim 1, wherein the complex impedance of the second electrical circuit comprises a real part whose value is strictly negative.

3. The device of claim 1, wherein the second electrical circuit comprises a plurality of field effect transistors coupled to an inductive component.

4. The device of claim 1, wherein the first electrical circuit comprises at least one diode of the varicap type.

5. The device of claim 1, wherein the first electrical circuit comprises at least one switched capacity.

6. The device of claim 1, wherein the resonator is of the Bulk Acoustic Wave or Surface Acoustic Wave type.

7. The device of claim 1, further comprising a third electrical circuit coupled in parallel to the resonator, to the first and the second electrical circuits, and with a complex impedance whose real part has a strictly negative value.

8. The device of claim 7, wherein the third electrical circuit comprises at least one differential pair formed by at least two field effect transistors.

9. Voltage controlled oscillator comprising at least the device of claim 1.

10. Electronic filter comprising at least the device of claim 1.