Spectral Filtering Systems
First Claim
Patent Images
1. A monolithic integrated circuit comprising:
- an input for receiving an electrical signal;
a first path having a signal input for receiving the unfiltered signal, a signal output, and an adjustable first path signal scaling block;
a second path connected to the first path between the signal input and the signal output, the second path having an adjustable delay element and an adjustable second path signal scaling block; and
a fixed gain block located in the first path and connected between a second path input and a second path output connected to the first path;
wherein, the monolithic integrated circuit is configured to communicate with;
a detector connected to the signal output for detecting properties of an output signal; and
a controller connected to adjust the delay element, the second path signal scaling block, and the first path signal scaling block based on the properties detected by the detector to control the filtering and amplifying characteristics of the front end circuit.
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Abstract
A spectral transform system includes a first path having a signal input, a signal output, and an adjustable first path signal scaling block. A second path is connected to the forward path between the signal input and the signal output. The second path has an adjustable delay element and an adjustable second path signal scaling block. A detector is connected to the signal output for detecting properties of an output signal. A controller is connected to adjust the delay element, the second path signal scaling block, and the first path signal scaling block based on the properties detected by the detector to achieve a desired output signal.
34 Citations
49 Claims
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1. A monolithic integrated circuit comprising:
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an input for receiving an electrical signal; a first path having a signal input for receiving the unfiltered signal, a signal output, and an adjustable first path signal scaling block; a second path connected to the first path between the signal input and the signal output, the second path having an adjustable delay element and an adjustable second path signal scaling block; and a fixed gain block located in the first path and connected between a second path input and a second path output connected to the first path; wherein, the monolithic integrated circuit is configured to communicate with; a detector connected to the signal output for detecting properties of an output signal; and a controller connected to adjust the delay element, the second path signal scaling block, and the first path signal scaling block based on the properties detected by the detector to control the filtering and amplifying characteristics of the front end circuit.
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2. A mobile telephone comprising:
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a transmit/receive switch; a subsampling analog-to-digital converter; and a front-end circuit coupled between the transmit/receive switch and the subsampling analog-to-digital converter, for filtering and amplifying an unfiltered signal, the front-end circuit consisting essentially of; a regenerative feedback circuit comprising; a fixed gain block; an input attenuation control; a loop gain control; a loop delay; and a controller connected to adjust the input attenuation control, the loop gain control and the loop delay based on the properties measured by a detector to control the filtering and amplifying characteristics of the front end circuit; wherein at least the input attenuation control, the loop gain control and the loop delay are located on the same monolithic integrated circuit as the fixed gain block.
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3. An apparatus for processing an electrical signal, the apparatus comprising:
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a front-end circuit consisting essentially of; a first path having a signal input for receiving an unfiltered signal, a signal output, and an adjustable first path signal scaling block; a second path connected to the first path between the signal input and the signal output, the second path having an adjustable delay element and an adjustable second path signal scaling block; a fixed gain block located in the first path and connected between a second path input and a second path output connected to the first path; a detector connected to the signal output for detecting properties of an output signal; and a controller connected to adjust the delay or phase shifting element, the second path signal scaling block, and the first path signal scaling block based on the properties detected by the detector to control the filtering and amplifying characteristics of the front end circuit; wherein at least the delay element, the second path signal scaling block, and the first path signal scaling block are located on the same monolithic integrated circuit as the fixed gain block. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13-46. -46. (canceled)
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47. A monolithic integrated circuit comprising:
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an input for receiving an unfiltered, unamplified signal; and an output for outputting a filtered and amplified version of the input signal; wherein the monolithic integrated circuit exhibits a bandpass frequency response with a Q value greater than 500, where the center frequency of the bandpass filter can be adjusted to multiple frequencies within a predefined range exclusive of a local oscillator.
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48. An apparatus comprising:
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a front-end circuit; wherein the front-end circuit is implemented in a monolithic integrated circuit.
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49. An apparatus comprising:
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a front-end circuit; wherein the front-end circuit is implemented exclusive of a ceramic-filter or a SAW.
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Specification