LC-tank oscillator having intrinsic low-pass filter
First Claim
1. An oscillator for generating oscillation signals at two output terminals, comprising:
- an inductor coupled between the two output terminals;
a capacitor coupled between the two output terminals;
two P-type transistors, wherein source electrodes of the two P-type transistors are coupled to a supply voltage, and gate electrodes of the two P-type transistors are coupled to the two output terminals, respectively; and
two N-type transistors, wherein gate electrodes of the two N-type transistors are coupled to the two output terminals, respectively, and drain electrodes of the two N-type transistors are directly connected to drain electrodes of the two P-type transistors, respectively;
wherein the drain electrodes of the two N-type transistors are directly connected to two internal nodes of the inductor; and
the capacitor and a portion of the inductor form a low-pass filter for filtering an unwanted frequency component.
1 Assignment
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Accused Products
Abstract
An oscillator for generating oscillation signals at two output terminals includes an inductor coupled between the two output terminals, a capacitor coupled between the two output terminals, two P-type transistors and two N-type transistors. Source electrodes of the two P-type transistors are coupled to a supply voltage, and gate electrodes of the two P-type transistors are coupled to the two output terminals, respectively. Source electrodes of the two N-type transistors are coupled to a supply voltage, gate electrodes of the two N-type transistors are coupled to the two output terminals, respectively, and drain electrodes of the two N-type transistors are coupled to drain electrodes of the two P-type transistors, respectively. In addition, the drain electrodes of the two N-type transistors are coupled to two internal nodes of the inductor.
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Citations
27 Claims
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1. An oscillator for generating oscillation signals at two output terminals, comprising:
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an inductor coupled between the two output terminals; a capacitor coupled between the two output terminals; two P-type transistors, wherein source electrodes of the two P-type transistors are coupled to a supply voltage, and gate electrodes of the two P-type transistors are coupled to the two output terminals, respectively; and two N-type transistors, wherein gate electrodes of the two N-type transistors are coupled to the two output terminals, respectively, and drain electrodes of the two N-type transistors are directly connected to drain electrodes of the two P-type transistors, respectively; wherein the drain electrodes of the two N-type transistors are directly connected to two internal nodes of the inductor; and
the capacitor and a portion of the inductor form a low-pass filter for filtering an unwanted frequency component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 12, 13, 14)
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8. An oscillator for generating oscillation signals at two output terminals, comprising:
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an inductor coupled between the two output terminals; a capacitor coupled between the two output terminals; two P-type transistors, wherein source electrodes of the two P-type transistors are coupled to a supply voltage, and gate electrodes of the two P-type transistors are coupled to the two output terminals, respectively; and two N-type transistors, wherein gate electrodes of the two N-type transistors are coupled to the two output terminals, respectively, and drain electrodes of the two N-type transistors are directly connected to drain electrodes of the two P-type transistors, respectively;
wherein the drain electrodes of the two N-type transistors are coupled to two internal nodes of the inductor;a switch module, coupled between the drain electrodes of two N-type transistors and the two internal nodes of the inductor, for selectively connecting the drain electrodes of two N-type transistors to the two internal nodes of the inductor or not; wherein the switch module further selectively connects the drain electrodes of two N-type transistors to other two internal nodes of the inductor or not. - View Dependent Claims (9, 10)
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15. An oscillator for generating oscillation signals at two output terminals, comprising:
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two P-type transistors, wherein source electrodes of the two P-type transistors are coupled to a supply voltage, and gate electrodes of the two P-type transistors are coupled to the two output terminals, respectively; two N-type transistors, wherein gate electrodes of the two N-type transistors are coupled to the two output terminals, respectively, and drain electrodes of the two N-type transistors are coupled to drain electrodes of the two P-type transistors, respectively; and a low-pass filter, coupled to the two P-type transistors and the two N-type transistors, for filtering a frequency component of the oscillation signals generated according to a first inductor and a parasitic capacitance; wherein the low-pass filter is formed by a second inductor and a capacitor, and the second inductor is different from the first inductor. - View Dependent Claims (16, 17)
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18. An oscillator for generating oscillation signals at two output terminals, comprising:
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an inductor coupled between the two output terminals; a capacitor coupled between the two output terminals; two first transistors, wherein each of the first transistors has a first electrode, a second electrode and a gate electrode, the first electrodes of the two first transistors are coupled to a supply voltage, and the gate electrodes of the two first transistors are coupled to the two output terminals, respectively; and two second transistors, wherein each of the second transistors has a first electrode, a second electrode and a gate electrode, the gate electrodes of the two second transistors are coupled to the two output terminals, respectively, and the first electrodes of the two second transistors are directly connected to the second electrodes of the two first transistors, respectively; wherein the first electrodes of the two second transistors are directly connected to two internal nodes of the inductor; and
the capacitor and a portion of the inductor form a low-pass filter for filtering an unwanted frequency component. - View Dependent Claims (19)
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20. An oscillator for generating oscillation signals at two output terminals, comprising:
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an inductor coupled between the two output terminals; a capacitor coupled between the two output terminals; two first transistors, wherein each of the first transistors has a first electrode, a second electrode and a gate electrode, the first electrodes of the two first transistors are coupled to a supply voltage, and the gate electrodes of the two first transistors are coupled to the two output terminals, respectively; and two second transistors, wherein each of the second transistors has a first electrode, a second electrode and a gate electrode, the gate electrodes of the two second transistors are coupled to the two output terminals, respectively, and the first electrodes of the two second transistors are directly connected to the second electrodes of the two first transistors, respectively;
wherein the first electrodes of the two second transistors are coupled to two internal nodes of the inductor;a switch module, coupled between the drain electrodes of two second transistors and the two internal nodes of the inductor, for selectively connecting the drain electrodes of two second transistors to the two internal nodes of the inductor or not; wherein the switch module further selectively connects the drain electrodes of two second transistors to other two internal nodes of the inductor or not.
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21. An oscillator for generating oscillation signals at two output terminals, comprising:
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an inductor coupled between the two output terminals; a capacitor coupled between the two output terminals; two transistors, wherein each of the transistors has a first electrode, a second electrode and a gate electrode, the first electrodes of the two transistors are coupled to a first reference voltage, the second electrodes of the two transistors are coupled to a second reference voltage, and the gate electrodes of the two transistors are coupled to the two output terminals, respectively; wherein the first electrodes of the two transistors are directly connected to two internal nodes of the inductor; and
the capacitor and a portion of the inductor form a low-pass filter for filtering an unwanted frequency component. - View Dependent Claims (22, 23, 24)
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25. An oscillator for generating oscillation signals at two output terminals, comprising:
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an inductor coupled between the two output terminals; a capacitor coupled between the two output terminals; two transistors, wherein each of the transistors has a first electrode, a second electrode and a gate electrode, the first electrodes of the two transistors are coupled to a first reference voltage, the second electrodes of the two transistors are coupled to a second reference voltage, and the gate electrodes of the two transistors are coupled to the two output terminals, respectively;
wherein the first electrodes of the two transistors are coupled to two internal nodes of the inductor;a switch module, coupled between the first electrodes of the two transistors and the two internal nodes of the inductor, for selectively connecting the first electrodes of the two transistors to the two internal nodes of the inductor or not; wherein the switch module further selectively connects the first electrodes of the two transistors to other two internal nodes of the inductor or not. - View Dependent Claims (26, 27)
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Specification