A constant current source circuit includes a current mirror circuit supplying a load circuit with an output current which is regulated on the basis of a reference current, a transistor having an emitter, a collector connected to a first power source line, and a base coupled to the current mirror circuit, and a resistor coupled between the emitter and base. The reference current passes through the resistor. A current control circuit controls a current directed to a second power source line in accordance with a bias voltage. The above current consists of the reference current and a collector current passing through the transistor. A bias circuit having a current path derives the bias voltage from a current passing from the first power source line to the second power source line through the current path.

Constant current source circuit

A voltage reference source with high-order temperature compensation circuit belongs to the electronic technical field The voltage reference source comprises a starting current and positive temperature coefficient current generating circuit, a negative temperature coefficient current generating circuit, a high-order temperature compensation current generating circuit and a superimposition and summation output circuit The added high-order temperature compensation current generating circuit performs linearization to the breakover voltage VBE between the voltage of the base and emitter of a triode to obtain a high-order compensation amount which is in agreement with the high-order temperature amount of the PN junction voltage, and the high-order temperature coefficient of the PN junction voltage can be eliminated fundamentally after proportional offset, thus realizing a CMOS voltage reference source with the lower temperature coefficient The voltage reference source is prepared by the common CMOS technology with lower cost, has extremely low temperature coefficient, less power consumption and smaller area, and can be used in the reference circuits such as analog circuits and digital-analog hybrid circuits which are required to have low temperature coefficients

Voltage reference source with high-order temperature compensation circuit

The invention discloses a reference power circuit, which comprises a band gap reference power circuit, a voltage and current conversion circuit and a current add circuit, wherein the band gap reference power circuit is used for generating first current of a positive temperature coefficient and reference voltage of a negative temperature coefficient; the voltage and current conversion circuit is used for converting the reference voltage of the negative temperature coefficient into second current with a negative temperature coefficient; and the current add circuit is used for superposing the first current of the positive temperature coefficient and the second current with the negative temperature coefficient to generate reference current. The output accuracy of the reference power circuit is high, and the temperature drift characteristic and the power voltage rejection ratio characteristic are improved.

Reference power circuit

Band-gap reference circuit applied to passive ultra-high frequency radio frequency identification device (UHFRFID) label chip

Reference voltage source circuit

PURPOSE:To produce the reference voltage which has a fixed voltage difference that can be optionally set from a reference power supply voltage and also has the variable temperature characteristics of said voltage difference, by producing the voltage having a positive temperature coefficient from a reference voltage source of a band gap, etc. together with the voltage having the positive and negative temperature coefficients and then applying these two types of voltage in series for production of the reference voltage. CONSTITUTION:A reference voltage generating circuit flows a current 1 having a positive coefficient to a resistance R2 from a reference power supply to produce the voltage IR2 having a positive temperature coefficient under the control of a voltage source having no temperature characteristics such as a band gap voltage source. While the voltage VCE2 having a negative temperature coefficient is produced in series to the voltage IR2 from the current 1. These two types of voltage are added together to obtain the voltage DELTAV and the voltage Vout of a fixed level lower than the voltage V2 of the reference power supply by an amount equal to DELTAV is obtained. Here the ratio between the ratio IR2 and the VCE2 is changed to vary the temperature coefficient of the voltage DELTAV. Thus the temperature characteristics of the Vout can be changed.

Circuit for generating reference voltage

PURPOSE:To increase the maximum operating frequency by connecting a resistor and a peaking circuit in series as a load of a differential pair transistor (TR) so as to cancel the effect of the stray capacitance in existence to the collector of the differential TR. CONSTITUTION:The impedance viewing toward the emitter of a TR Q9 at a prescribed high frequency region is inductive in a circuit comprising the load TR Q9 and resistors RC1, RB1 in an emitter coupling logic FF circuit subject to circuit integration to form a peaking circuit 10 having a characteristic known as the peaking characteristic. Similarly, a load TR Q10, resistors RC2, RB2 form a peaking circuit 11 similarly. Thus, the effect by the stray capacitance existing between collector connecting points N1, N2 and the ground is cancelled. Thus, the frequency characteristic of the FF circuit is improved and the self-running frequency being an indication of the maximum operating frequency is improved remarkably. Even with a clock input exceeding 1MHz, the circuit is operated stably.

Oida Yoshio

Papers

Circuit for generating reference voltage

Flip-flop circuit