Circuit to extend frequency response of accelerometer
OwnerGarimella R Sarmainventor
Life of this patent
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Abstract
A compensation circuit connected to an accelerometer's output extends the frequency response of the accelerometer, while reducing noise produced by the accelerometer. The compensation circuit has a gain as a function of frequency that is (i) constant up to a first frequency that is less than the accelerometer's natural resonance frequency, and (ii) reduced to approximately zero at a second frequency that is greater than the accelerometer's natural resonance frequency.
Claims6
A system for extending the frequency response of an accelerometer while reducing noise produced by the accelerometer, comprising a compensation circuit connected to the accelerometer's output, said compensation circuit having a gain as a function of frequency, said gain being (i) constant up to a first frequency wherein said first frequency is less than the accelerometer's natural resonance frequency, and (ii) reduced as a function of frequency to approximately zero at a second frequency wherein said second frequency is greater than the accelerometer's natural resonance frequency.
A system, comprising:
- an accelerometer having a natural resonance frequency associated therewith and having an output, said accelerometer generating a constant-gain frequency response up to a first frequency wherein said first frequency is less than said natural resonance frequency;
- and
- a compensation circuit having an input and an output, said input of said compensation circuit connected to said output of said accelerometer, said compensation circuit having a gain as a function of frequency, said gain being (i) constant up to a second frequency wherein said second frequency is greater than said first frequency and less than said natural resonance frequency, and (ii) reduced as a function of frequency to approximately zero at a third frequency wherein said third frequency is greater than said natural resonance frequency.
A system for extending the frequency response of an accelerometer while reducing noise produced by the accelerometer, comprising a compensation circuit including
- a first T-network in parallel with a first capacitor, said first T-network defined by two common-value resistors and a capacitor connected therebetween and to ground,
- an operational amplifier having a non-inverting input coupled to ground, an inverting input, and an output, and
- a second T-network in parallel with a parallel resistance-capacitance (RC) circuit, wherein said second T-network is identical to said first T-network, and wherein said parallel RC circuit is defined by a second capacitor in parallel with a first resistor,
- wherein said first T-network is connected between the accelerometer's output and said inverting input of said operational amplifier, and
- wherein said second T-network in parallel with said parallel RC circuit is connected to said inverting input of said operational amplifier and said output of said operational amplifier.
Dependencies are inferred from the claim text.