Analog signal characterizer for functional transformation
AssigneesKokusai Electric Corporation, Yozan Inc.
InventorsNobuaki Kawahara, Kenzo Urabe, Changming Zhou, Guoliang Shou
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Abstract
A signal characterizer for performing functional transformations such as Fast Fourier Transforms (FFTs), which converts an input serial analog signal into a plurality of parallel discrete signals using an analog-type serial-to-parallel converter. The discrete signals are then supplied to the input terminals of butterfly operation circuits to process the parallel discrete signals into a plurality of transformed signals. A switch supplies the transformed signals to a serial signal output terminal. The switch is controlled by a controller so that the input signal sequence is converted to a serial signal sequence according to a predetermined order.
Claims17
A signal characterizer applying a functional transformation to a serial analog signal, comprising:
- an analog-type serial-to-parallel converter which converts the serial analog signal into a plurality of discrete parallel signals;
- a functional transformer, coupled to the serial-to-parallel converter, having a plurality of parallel input terminals which input the discrete parallel signals, a butterfly operation circuit which transforms the discrete parallel signals into a plurality of transformed signals according to a predetermined functional transformation, and a plurality of parallel output terminals, equal in number to the number of parallel input terminals, which output the transformed signals;
- an output switch, having a serial output terminal, which supplies the transformed signals from the parallel output terminals to the serial output terminal;
- and an output switch controller which generates an output switch control signal to control the output switch in order to output the transformed signals to the serial output terminal according to a predetermined order, wherein,
- the analog-type serial-to-parallel converter contains an analog shift register having a plurality of sample holders connected in series, and
- each of the sample holders includes an output terminal connected to one of the parallel input terminals.
A signal characterizer applying a functional transformation to a serial analog signal, comprising:
- an analog-type serial-to-parallel converter which coverts the serial analog signal into a plurality of discrete parallel signals arranged in predetermined order;
- a functional transformer, coupled to the serial-to-parallel converter, having a plurality of parallel input terminals which input the discrete parallel signals, a butterfly operation circuit which transforms the discrete parallel signals into a plurality of transformed signals according to a predetermined functional transformation, and a plurality of parallel output terminals, equal in number to the number of parallel input terminals, which output the transformed signals;
- and
- an output switch, having a serial output terminal which supplies the transformed signals from the parallel output terminals to the serial output terminal sequentially wherein,
- the analog-type serial-to-parallel converter contains an analog demultiplexer which includes a first input switch and a plurality of capacitors, the first input switch inputs the serial analog signal deriving a plurality of analog input signals, and supplies the analog input signals to a plurality of capacitors according to a predetermined order to store the analog input signals.
A signal characterizer applying a functional transformation to a serial analog signal, comprising:
- an analog-type serial-to-parallel converter which converts the serial analog signal to a plurality of discrete parallel signals arranged in predetermined order;
- a functional transformer, coupled to the serial-to-parallel converter, having a plurality of parallel input terminals which input the discrete parallel signals, a butterfly operation circuit which transforms the discrete parallel signals into a plurality of transformed signals according to a predetermined functional transformation, and a plurality of parallel output terminals, equal in number to the parallel input terminals, which output the transformed signals;
- an output switch, having a serial output terminal, which supplies the transformed signals from the parallel output terminals to the serial output terminal;
- an output switch controller which generates an output switch control signal to control the output switch in order to output the transformed signals to the serial output terminal sequentially, wherein,
- the analog-type serial-to-parallel converter contains an analog shift register having a plurality of sample holders connected in series, and
- each of the sample holders contains an output terminal connected to one of the parallel input terminals.
Dependencies are inferred from the claim text.