Resonator

• US 20010022535A1
• Filed: 03/12/2001
• Published: 09/20/2001
• Est. Priority Date: 03/14/2000
• Status: Active Grant

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Stikvoort, Eduard Ferdinand
• Granted Patent: US 6,346,860 B2
• Time in Patent Office: Days
• US Class Current: 330/303
• CPC Class Codes: H03B 27/00 Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs
• CPC Class Codes: H03B 5/24 active element in amplifier being semiconductor device H03B5/26 takes precedence

Abstract

Resonator comprising first and second balanced integrators (I1, I2) each composed with a balanced amplifier and having a non-inverting (in+) and an inverting (in−) input terminal, as well as a non-inverting (out+) and an inverting (out−) output terminal. First and second coupling circuits (Y1, Y2) are interconnected between the non-inverting output terminal (out+) of the first integrator (I1) and the non-inverting input terminal (in+) of the second integrator (I2) and between the inverting output terminal (out−) of the first integrator (I1) and the inverting input terminal (in−) of the second integrator (I2) respectively. Feedback circuits (Y3, Y4) are interconnected between the non-inverting output terminal (out+) of the second integrator (I2) and the inverting input terminal (in−) of the first integrator (I1) and between the inverting output terminal (out−) of the second integrator (I2) and the non-inverting input terminal (in+) of the first integrator (I1) respectively. The balanced integrators (I1, I2) are constituted by two semiconductor elements (T1, T2) interconnected as a differential amplifier, in which a feedback capacitor (C1, C2) is directly connected between the output terminal (out+, out−) and the input terminal (in+, in−) of each semiconductor element (T1, T2). At least one of the coupling and feedback circuits (Y1, Y2, Y3, Y4) comprises a series connection of a high-to-low impedance converter (T3) and a conductance (G). (FIG. 1)

Claims

1. Resonator, comprising:

first and second balanced integrators (I1, I2) each having a non-inverting (in+) and an inverting (in−

) input terminal, as well as a non-inverting (out+) and an inverting (out−

) output terminal,

first and second coupling circuits (Y1, Y2) between the non-inverting output terminal (out+) of the first integrator (I1) and the non-inverting input terminal (in+) of the second integrator (I2) and between the inverting output terminal (out−

) of the first integrator (I1) and the inverting input terminal (in−

) of the second integrator (I2), respectively, and

feedback circuits (Y3, Y4) between the non-inverting output terminal (out+) of the second integrator (I2) and the inverting input terminal (in−

) of the first integrator (I1) and between the inverting output terminal (out−

) of the second integrator (I2) and the non-inverting input terminal (in+) of the first integrator (I1), respectively,

wherein at least one of the coupling and feedback circuits (Y1, Y2, Y3, Y4) comprises a series connection of a high-to-low impedance converter (T3) and a conductance (G).

2. Resonator according to

claim 1

, wherein the high-to-low impedance converter is constituted by an emitter- or source-follower (T3).

3. Resonator according to

claim 2

, wherein a capacitor (C3) is connected between a control terminal of the said follower (T3) and a terminal of the conductance (G) that is not connected to an emitter or source terminal of the follower (T3).

4. Resonator according to

claim 1

, wherein the conductance (G) is adjustable.

5. Resonator according to

claim 4

, wherein the conductance (G) is constituted by a MOS transistor, to a control terminal of which a controllable current source is coupled.

6. Resonator according to

claim 4

, wherein the conductance (G) is constituted by a series connection of at least two MOS transistors (T4, T5), to control terminals of which a controllable current source (dc5) is coupled.

7. Resonator as claimed in

claim 1

, wherein the balanced integrators (I1, I2) include two semiconductor elements (T1, T2) interconnected as a differential amplifier, in which a feedback capacitor (C1, C2) is coupled between the output terminal (out+, out−

) and the input terminal (in+, in−

) of each semiconductor element (T1, T2).

8. Resonator as claimed in

claim 7

, wherein the feedback capacitor (C1, C2) is directly connected between the output terminal (out+, out−

) and the input terminal (in+, in−

) of each semiconductor element (T1, T2).

9. Polyphase resonator comprising 4 input (a, b, c, d), 4 output terminals (A, B, C, D) and the resonator according to

claim 7

, wherein said 4 input and output terminals are connected to the corresponding input and output terminals of the semiconductor elements (T1, T2) of the differential amplifiers.