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Amplifier circuit
US9559647B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9559647-B2 |
| Application number | US-201214402681-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 21, 2012 |
| Priority date | May 21, 2012 |
| Publication date | Jan 31, 2017 |
| Grant date | Jan 31, 2017 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The present disclosure relates to an amplifier circuit ( 2 ) for a capacitive transducer ( 1 ), comprising a preamplifier ( 8 ) adapted to receive a transducer signal through an input node ( 9 ) and to provide an amplified signal at an output node ( 10 ), and a transconductance amplifier ( 11 ) comprising a first input ( 12 ) and an output ( 14 ), wherein the first input ( 12 ) of the transconductance amplifier ( 11 ) is connected to the output node ( 10 ), and the output ( 14 ) of the transconductance amplifier ( 11 ) is connected to the input node ( 9 ).
First claim
Opening claim text (preview).
The invention claimed is: 1. An amplifier circuit for a capacitive transducer, comprising: a preamplifier adapted to receive a transducer signal through an input node and to provide an amplified signal at an output node; and a transconductance amplifier comprising a first input and an output, wherein the first input of the transconductance amplifier is connected to the output node, and the output of the transconductance amplifier is connected to the input node, wherein a capacitive attenuator circuit is connected between the output of the transconductance amplifier and the input node of the preamplifier, wherein the transconductance amplifier further comprises a second input connected to a reference voltage source, and wherein the transconductance amplifier is configured to provide a signal at the output that corresponds to the difference between the signals applied to its first and its second input. 2. The amplifier circuit according to claim 1 , wherein the transconductance amplifier is a class AB amplifier. 3. The amplifier circuit according to claim 1 , wherein a current mirror circuit is connected in series between the output of the transconductance amplifier and the input node of the preamplifier. 4. The amplifier circuit according to claim 3 , wherein the current mirror circuit is adapted to downscale an output current provided by the output of the transconductance amplifier. 5. The amplifier circuit according to claim 1 , wherein the capacitive attenuator circuit comprises a first capacitance connected in series between the output of the transconductance amplifier and the input node of the preamplifier and a pair of anti-parallel diodes connected in parallel to the first capacitance. 6. The amplifier circuit according to claim 5 , wherein the AC impedance of the anti-parallel diodes is higher than the AC impedance of the first capacitance. 7. The amplifier circuit according to claim 5 , wherein the capacitive attenuator circuit comprises a second capacitance connected in series between a reference terminal and a node arranged in a path connecting the output of the transconductance amplifier and the first capacitance. 8. The amplifier circuit according to claim 7 , wherein the second capacitance has a larger capacitance than the first capacitance.
Assignees
Inventors
Classifications
Only one input of the dif amp being used for an input signal · CPC title
Low-frequency amplifiers, e.g. audio preamplifiers · CPC title
by using a signal derived from the output signal · CPC title
Differential amplifier with circuit arrangements to enhance the transconductance · CPC title
there being a feedback over one or more internal stages in the global amplifier · CPC title
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Frequently asked questions
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- What does patent US9559647B2 cover?
- The present disclosure relates to an amplifier circuit ( 2 ) for a capacitive transducer ( 1 ), comprising a preamplifier ( 8 ) adapted to receive a transducer signal through an input node ( 9 ) and to provide an amplified signal at an output node ( 10 ), and a transconductance amplifier ( 11 ) comprising a first input ( 12 ) and an output ( 14 ), wherein the first input ( 12 ) of the transcond…
- Who is the assignee on this patent?
- Nielsen Ivan Riis, Epcos Ag
- What technology area does this patent fall under?
- Primary CPC classification H03F1/26. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 31 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).