8 results about "Current mirror" patented technology

A voltage generation circuit may include a static current circuit and/or a current mirror. The static current circuit may include a first resistor. The current mirror may include a second resistor, a third resistor, and/or an output terminal.

The invention relates to the technical field of integrated circuits, in particular to a current mirror. The current mirror is characterized in that the current mirror is composed of a PMOS transistor MP1, a PMOS transistor MP2, an NMOS transistor MN1, a capacitor C1, a capacitor C2, a resistor R1, an input current source, an output end current source and a bias current source. The source electrode of the MP1 is connected with a power source VCC, the grid electrode of the MP1 is connected with the grid electrode of the MP2, and the drain electrode of the MP1 is connected with positive electrode of the input current source. The negative electrode of the input electrode source is grounded VSS. The drain electrode of the MN1 is connected with the power source VCC, the grid electrode of the MN1 is connected with the positive electrode of the input current source, the source electrode of the MN1 is connected with the positive electrode of the bias current source, and the substrate of the MN1 is connected with a connection point of the grid electrode of the MP1 and the grid electrode of the MP2 through the R1. A connection point of the source electrode of the MP1 and the drain electrode of the MN1 is connected with a connection point of the grid electrode of MN1 and the positive electrode of the input current source through the C1 and the C2 sequentially. The source electrode of the MP2 is connected with the power source VCC, and the drain electrode of the MP2 is connected with the positive electrode of an output current source. The current mirror has the advantages of being suitable for being used under low supply voltage, meanwhile improving the PSR of the current mirror, and being especially suitable for a current mirror circuit.

The invention discloses a current generating circuit with an adjustable temperature coefficient. The current generating circuit comprises a current mirror, an operational amplifier, a switching tube,at least two positive temperature coefficient resistors, at least two negative temperature coefficient resistors, a positive temperature coefficient switch and a negative temperature coefficient switch. Thus, on the basis of a voltage-to-current circuit in the prior art, output current is appropriately matched, the current generating circuit achieves the adjustable temperature coefficient, resistance matching is different from traditional pure serial connection or pure parallel connection, and circuit space is saved; the accuracy of the temperature coefficient is high.

The invention discloses a low-power consumption bandwidth multiplication chopping stabilized operational amplifier based on an MOS (metal oxide semiconductor) device, which belongs to the field of design of analog integrated circuits. The low-power consumption bandwidth multiplication chopping stabilized operational amplifier comprises two frequency mixers, a shunt input stage, an intermediate stage for amplifying recovered current and a rail-to-rail output stage, wherein one frequency mixer is placed in front of an amplifier input stage, and the other frequency mixer is placed behind an amplifier output stage, thereby realizing the functions of raising frequency and reducing frequency of input signals; the shunt input stage is used for converting input voltage signals to current signals and forming small signal current in forward and backward directions; the intermediate stage for amplifying the recovered current comprises four low-voltage current mirrors and can realize the amplification of the recovered current; and the rail-to-rail output stage is used for realizing the rail-to-rail output of the signals. The low-power consumption bandwidth multiplication chopping stabilized operational amplifier has the capacity of improving bandwidth by nearly three times under the situation of not obviously increasing power consumption, and can reduce low-frequency 1/f noise, increase low-frequency gain, and reduce power consumption above one half while keeping the same bandwidth, the noise and other performances, thereby further improving the performances of the circuit.

An output circuit comprises first and second transistors, a driving circuit and a current mirror circuit. The driving circuit supplies a relatively small constant current to the base of the first transistor. When a current flows to the collector of the first transistor, a current with a magnitude set at a fixed ratio with respect to the current flows to the collector of the second transistor, and a current proportional to the current flowing to the collector of the second transistor flows to the base of the first transistor by way of the current mirror circuit. That is, a current, which is determined in accordance with a current flowing to the collector of the first transistor, flows to the base of the first transistor.

A bandgap reference voltage circuit comprises a current mirror unit, an operation amplifier (OP), a first resistor, a second resistor, an auxiliary unit, and a voltage generation circuit. An output end of the OP is coupled to a feedback end of the current mirror unit. An end of the first resistor and an end of the second resistor are coupled to a positive input end of the OP. Another end of the first resistor is coupled to a second end of the current mirror unit. A second end of the voltage generation circuit is coupled to another end of the second resistor. An end of the auxiliary unit is coupled to a negative input end of the OP and a first end of the voltage generation circuit, and another end of the auxiliary unit is coupled to the first end of the current mirror unit.

The invention discloses a low-power-dissipation power supply circuit. The circuit comprises a biasing sub-circuit for providing a biasing voltage, a current source sub-circuit which is connected with the biasing sub-circuit and is used in mirror current, an amplifying sub-circuit connected with the current source sub-circuit, a current mirror sub-circuit connected with the amplifying sub-circuit, and a feedback sub-circuit and compensating capacitor connected with the amplifying sub-circuit and the current mirror sub-circuit, wherein the current source sub-circuit provides work current for the low-power-dissipation power supply circuit, and the amplifying sub-circuit compares an output voltage of the feedback sub-circuit with a reference voltage of a reference voltage end and amplifies a comparison result to respond to the change of load current. In the low-power-dissipation power supply circuit, the circuit structure is stable, the change of the load current can be quickly responded to, and the nanoampere level of static power dissipation is achieved.

The invention relates to a method for linked switch a current mirror and stabilizing output current, wherein the current mirror comprises a plurality of output nodes, a bias provider, a plurality of current mirror projectors and a plurality of switch elements. The bias provider provides a reference bias voltage according to received current, each current mirror projector is coupled with the bias provider to receive the reference voltage to output an output current according to the reference voltage, the control end of each switch element receives a clock signal via which to couple the first end with the second end or the third end, the first end of the i-th switch element is coupled with the output of the i-th current mirror projector while the second end is coupled with the i-th output node, and the third end is coupled with the i+1-th output node, i natural number.