摘要:
A multiple-delay variable delay circuit uses a random access memory (RAM) array to provide adjustable delay of a block of input data, such as previously necessitated use of an extensive shift register configuration. A single RAM array, having a given capacity, is used to economically provide individual delays to a plurality of blocks of input data, with the aggregate of the individual delays not exceeding the capacity of the single RAM array. Time-shared use of a high speed RAM enables simultaneous single-port processing of data blocks, with delay control circuits providing utilization of separate portions of the RAM capacity, to provide individual delays resulting from successive read/write cycles utilizing a desired total of incremental delays. Simplified delay control circuits provide manufacturing and operating economies with single-port or multi-port RAM arrays.
摘要:
A pipeline multiplier is used for multiplying a multiplicand to a multiplier. The pipeline multiplier includes a plurality of adder stages each adder stage includes a partial product processor for processing a partial product of the multiplicand and one of the multiplier. Each of the adder stages further includes a plurality of ripple carry adder (RCA) bands each band includes a plurality of full adders wherein the carry of the full adders ripple sequentially to the most significant full adder in the RCA band. Furthermore, each of the RCA bands in each adder stage includes approximately same number of full adders. The adder stages are further arranged in sequential order such that each of the RCA bands in each stage are pipelined to a corresponding RCA band, which is a RCA band being more-significantly-shifted by one bit, in next adder stage according to the sequential order whereby an accumulative partial product is propagated from one of the adder stages to a next stage. The full adders in each of the RCA band add the partial product from the partial product processing means to the accumulative partial product propagated from last adder stage according to the sequential order. Each of the adder stages further includes a half adder for adding the carry from the RCA band to a bit of the partial product which is the least significant bit of a next more significant RCA band in the adder stage for propagating a processed band-carry to the corresponding RCA band in the next adder stage as the most significant bit of the partial product and to a more significant RCA band in the next adder stage as a carry-in.
摘要:
The present invention discloses an apparatus for receiving an ordered sequence of input data and for delaying the output of a delay output item by a variable-length delay-time. The apparatus includes an input port for receiving the ordered sequence of input data and the variable-length delay-time. The apparatus further includes an integrated data storage, a random access memory (RAM) for storing the ordered sequence of input data according to a storage-order corresponding to the ordered sequence of the input data. The apparatus further includes a delay output port for accessing and outputting the delay output item in the storage means according to the variable-length delay-time and the storage-order such that the delay output item is delayed by the variable-length delay-time.
摘要:
A linear voltage regulator comprises a transistor for converting a supply voltage to an output voltage. By directly monitoring the supply voltage and thereby rapidly responding when the supply voltage suffers a ripple, the linear voltage regulator enhances the stability of the output voltage.
摘要:
The present invention discloses a multi-voltage headphone driver circuit comprising: at least one operational amplifier having an output supplied to a headphone speaker, the operational amplifier receiving a first power supply as its high operation voltage; a charge pump receiving a second power supply to generate a negative voltage corresponding to the second power supply in magnitude; and an m-fold circuit multiplying the negative voltage by m and providing the result to the operational amplifier as a low operation voltage thereof, wherein m is a real number.
摘要:
The present invention discloses a multi-voltage headphone driver circuit comprising: at least one operational amplifier having an output supplied to a headphone speaker, the operational amplifier receiving a first power supply as its high operation voltage; a charge pump receiving a second power supply to generate a negative voltage corresponding to the second power supply in magnitude; and an m-fold circuit multiplying the negative voltage by m and providing the result to the operational amplifier as a low operation voltage thereof, wherein m is a real number.
摘要:
For protecting a power system, two or three of over current, thermal and under voltage protection circuits are integrated as one protection circuit but operate independently, and one or more protection points thereof are adjusted dynamically in response to detected condition of the power system. Specifically, using voltage and current conditions in the power system to modify the over current protection and the thermal protection maximizes the performance of the power system and covers the process bias in the circuits.
摘要:
A speaker driver circuit driven by positive and negative voltages, comprising: at least one operational amplifier providing an output to a headphone speaker, and a voltage converter receiving a supplied voltage (VDD), generating r-fold positive and negative voltages (r·VDD and −r·VDD, wherein r is any positive real number except 1) according to the supplied voltage, and supplying the positive and negative voltages to the operational amplifier for its high and low operation voltage levels respectively.
摘要:
The present invention discloses a half-voltage headphone driver circuit, comprising: at least one operational amplifier providing an output to a headphone speaker, and a charge pump receiving a supply voltage (VDD), generating a positive half-voltage and a negative half-voltage (VDD/2 and −VDD/2) based on the supply voltage, and supplying the positive half-voltage and negative half-voltage as high and low operation levels to the at least one operational amplifier.
摘要:
A speaker driver circuit driven by positive and negative voltages, comprising: at least one operational amplifier providing an output to a headphone speaker, and a voltage converter receiving a supplied voltage (VDD), generating r-fold positive and negative voltages (r·VDD and −r·VDD, wherein r is any positive real number except 1) according to the supplied voltage, and supplying the positive and negative voltages to the operational amplifier for its high and low operation voltage levels respectively.