摘要:
A DA converter circuit is provided for use in a ΔΣ AD modulator. The DA converter circuit includes a DA converter of segment switched capacitor type. The DA converter includes an operational amplifier, capacitors as connected in parallel to each other to supply electric charges to the operational amplifier, an electrically charging switch for switching of electrically charging electric charges onto the respective capacitors or not, and an electrically discharging switch for switching or not electrically discharging electric charges from the respective capacitors or not. A switch device performs either one of the electrically charging, the electrically discharging, grounding, and polarity inversion onto the respective capacitors. A controller controls the electrically charging switch, the electrically discharging switch and the switch device to execute a process of second-order DWA algorithm for performing a second-order noise shaping of a non-linearity of the DA converter circuit.
摘要:
A DA converter circuit is provided for use in a ΔΣ AD modulator. The DA converter circuit includes a DA converter of segment switched capacitor type. The DA converter includes an operational amplifier, capacitors as connected in parallel to each other to supply electric charges to the operational amplifier, an electrically charging switch for switching of electrically charging electric charges onto the respective capacitors or not, and an electrically discharging switch for switching or not electrically discharging electric charges from the respective capacitors or not. A switch device performs either one of the electrically charging, the electrically discharging, grounding, and polarity inversion onto the respective capacitors. A controller controls the electrically charging switch, the electrically discharging switch and the switch device to execute a process of second-order DWA algorithm for performing a second-order noise shaping of a non-linearity of the DA converter circuit.
摘要:
A high-precision ΔΣ modulator reduces nonlinear noise due to the use of a multibit DAC and has little hardware and power consumption. A digital signal is DA converted and fed back to a subtraction circuit supplied with an analog signal. The DAC used in this feedback circuit uses a DAC (DWADAC) that includes a weighted pointer so that input digital signals are supplied in order to a plurality of segment elements that construct the DAC. In this DWADAC, the construction and number of the pointer is set based on the type and order of the filter disposed before the ADC.
摘要:
In a first-order complex band-pass filter, multiplexers are alternately switched over between time intervals of phases A and B, where the multiplexers includes two multiplexers provided at input and output stages, and a multiplexer provided in a feedback circuit of each of first-order filters and being switching over whether to invert a sign of a feedback signal. Then in a circuit part sandwiched between the multiplexers, a processing performed by an I circuit part and a processing performed by a Q circuit part are alternately switched over so that a sign of a signal inputted to an adder is inverted.
摘要:
A high-precision ΔΣ modulator reduces nonlinear noise due to the use of a multibit DAC and has little hardware and power consumption. A digital signal is DA converted and fed back to a subtraction circuit supplied with an analog signal. The DAC used in this feedback circuit uses a DAC (DWADAC) that includes a weighted pointer so that input digital signals are supplied in order to a plurality of segment elements that construct the DAC. In this DWADAC, the construction and number of the pointer is set based on the type and order of the filter disposed before the ADC.
摘要:
In a first-order complex band-pass filter, multiplexers are alternately switched over between time intervals of phases A and B, where the multiplexers includes two multiplexers provided at input and output stages, and a multiplexer provided in a feedback circuit of each of first-order filters and being switching over whether to invert a sign of a feedback signal. Then in a circuit part sandwiched between the multiplexers, a processing performed by an I circuit part and a processing performed by a Q circuit part are alternately switched over so that a sign of a signal inputted to an adder is inverted.
摘要:
A flange portion is provided with two abutting protrusions, a spacer is formed with two abutting projections, the respective abutting protrusions and the abutting projections are formed on the outside of a tightening point tightened by a tightening member (a spacer fixing bolt and a spacer fixing nut) in the width direction orthogonal to an imaginary line connecting the tightening points of the flange portions on both sides, and a gap G is formed between the flange portion and the spacer at the tightening point (an opening limb portion of a spacer mounting hole and an insertion hole limb portion of a head insertion hole) before being tightened by the tightening member, while the flange portion and the spacer come into abutment with each other at the tightening point after having tightened in a state in which the abutting protrusions and the abutting protrusions come into abutment with each other.
摘要:
A liquid supplying mechanism includes a flow channel forming member that has a base having a plate-like shape on which an upstream portion of a plurality of liquid supplying flow channels are formed so as to supply ink to each of a plurality of liquid ejection heads that are assembled to a liquid ejection head unit, and a plurality of connection members in a tubular shape that extend from one side of the of the base so as to form a downstream portion of the flow channels that individually communicate with the upstream portion of the respective liquid supplying flow channels and are disposed such that the distal end of the connection members correspond to the positions of the connection holes that are formed on the respective liquid ejection heads.
摘要:
A zoom lens according to the invention includes in order starting from an object side a first lens group having a positive refractive power; a second lens group having a negative refractive power and selectively moveable along an optical axis for zooming; an aperture stop; a third lens group having a positive refractive power and including a third-A lens group including a doublet lens including a positive lens and a negative lens and having at least one aspherical surface, selectively moveable along the optical axis for image blur compensation, and having a positive refractive power, and a third-B lens group including a positive lens and a negative lens; and a fourth lens group having a positive refractive power and selectively moveable along the optical axis to compensate for a variation in an image plane caused by the zooming and to perform focusing.
摘要:
A sub-carriage includes a first head mounting portion and a second head mounting portion. The second head mounting portion includes at least a portion of constitution members of an adjustment mechanism which adjusts a position of the second head, a first recording head of one side of the same set is fixed in a state of being positioned to the first head mounting portion so that the nozzles are disposed in a defined position, and a second recording head of the other side is fixed to the second head mounting portion in a state where the relative position to the first recording head is defined by the adjustment mechanism based on a landing position in a recording medium of ink ejected from predetermined nozzles of the second recording head with respect to a landing position in a recording medium of ink ejected from predetermined nozzles of the first head.