JPS6043852A - Integrated circuit - Google Patents

Abstract

PURPOSE:To enable to design a small-sized MOS integrated circuit in the same operating range by a method wherein the MOS integrated circuit has a voltage boosting circuit, a constant voltage circuit and an integrated circuit, and the constant voltage circuit is constituted so as to have output voltage temperature characteristics, wherewith the operating temperature characteristics of the internal circuit are compensated. CONSTITUTION:Under the state of T1, the voltage of an input terminal 1 is VDD and if a voltage boosting circuit 2 has double boosting characteristics, the voltage thereof becomes 2VDD. The output voltage VDD' of a constant voltage circuit 3 is set so as to be turned into voltage somewhat lower than VDD and the circuit 3 is let a temperature gradient have in such a way that the output voltage thereof rises with temperature rising. An internal circuit 4 is driven by the output voltage of the constant voltage circuit 3 and is designed in such a way that the operating characteristics thereof become most favorable when the output voltage of the constant voltage circuit 3 is VDD' at normal temperatures. Under the state of T2, the output voltage of the voltage boosting circuit 2 becomes VDD. When the lower limit of the stabilizing voltage range of the constant voltage circuit 3 is to be voltage between VDD' and VDD, the output voltage VDD of the voltage boosting circuit 2 is brought into constant voltage by the constant voltage circuit 3 and the internal circuit 4 is driven by VDD' in the same manner as in the state of T1. For that, the operating characteristics of the internal circuit 4 is favorable.

Description

[Detailed description of the invention] The present invention relates to a PoMUS integrated circuit.

General rc M, (J S It is ideal for an integrated circuit to have a wide operating range, but in reality, the operating range of VC is limited to a certain range due to the capabilities of internal devices and other influences. The operating range can be roughly divided into operating voltage range and operating temperature range, but in both cases, the operating range is limited because internal device performance decreases due to power supply voltage fluctuations and temperature fluctuations. When designing the MU8 integrated circuit, it is important to ensure that the MU8 integrated circuit operates with a margin at the most severe power supply voltage and temperature to ensure the target operating voltage range and operating temperature range. However, in the case of an IC with a wide operating voltage range and operating temperature range, as described above, the IC is designed under the most severe conditions, so the internal circuits operate with considerable margin under normal usage conditions. This has the disadvantage that it tends to result in an over-margin design, which leads to an increase in the V-tick size with a lot of waste.

The present invention has been made in consideration of the above-mentioned points, and provides an M (JS integrated circuit) having a wide operating range without over-margin design. It has a constant voltage circuit that fully stabilizes the output voltage of the constant voltage circuit, and an internal circuit that is driven by the output voltage of the constant voltage circuit, and the constant voltage circuit has a special output voltage temperature increase that compensates for the custom operating temperature of the internal circuit. The present invention provides an entire MO8 integrated circuit featuring:

Hereinafter, a detailed explanation of the present invention will be given with reference to examples.

FIG. 1 is a block diagram showing an embodiment of the present invention. l is an input terminal of an external power supply; 2 is a voltage booster; 3 is a constant voltage circuit that stabilizes the output voltage of the voltage booster; 4 is an internal It consists of circuit terrorism vcpυ, ROM, RAM, registers, etc. FIG. 2 shows changes in output voltage of each circuit. A is the input terminal for external power sound input.
B is the output voltage waveform of the voltage booster circuit 2; and B is the output voltage waveform of the constant voltage circuit 3. First, if the voltage at the input terminal 1 is UVDD in the state of 1゛l, and the voltage booster circuit now has twice the boost ghi, then the voltage of the voltage booster circuit 2 becomes 21Voi], and the voltage at the constant voltage circuit 3 output voltage Vn6
Set it so that the voltage is a little lower than vDD and c,
A temperature gradient is provided so that the output voltage increases as the temperature rises, and the internal circuit 4 is driven by the output voltage of the constant voltage circuit 3. The internal circuit 4 is designed to operate best when the output voltage of the voltage circuit 3 is VDD, which is constant at room temperature.In this way, when the external supply voltage is VDD, the internal circuit Power supply voltage VDD with best working customization
The performance is good when driven by h. Next, in the state of T2, the external supply voltage is changed from VDD to the lowest operating voltage V
2 VDDVc' fluctuates, but at this time the output voltage t' of the voltage booster circuit 2! If the voltage is between the lower limit of the stabilized voltage range of the constant voltage circuit 2■nD and VDD, the output voltage of the voltage booster circuit 2 is set to VDDtff, and the voltage of the constant voltage circuit 3 is regulated to VDD, and the internal circuit 4 is As in the state, it is driven by xVna, so the external supply voltage is V.
Even though it has dropped to 2, the operation customization is good. Even if the supply voltage from the outside increases, it will be driven by the internal circuit 1qVap for the reason rc mentioned above, and there will be no effect on the dynamic E'V-custom order. Next, the effect on temperature change wJ? I'll think about it. Assuming that the external supply voltage is 2 VDD, which is the minimum operating voltage, the output voltage of the constant voltage circuit 3 is VDD at room temperature, but as the temperature rises, the internal devices (with internal circuit terrorism)
MO8 transistors normally suffer from deterioration in performance due to a drop in performance at the normal operating voltage VpprC, but in the present invention, the output voltage VDD of the constant voltage circuit 3 compensates for the deterioration in the performance customization of the internal circuit. As the temperature increases, the performance of the internal devices does not decrease and the special order operation remains good.On the other hand, when the temperature decreases, the output voltage VDD of the constant voltage circuit 3 decreases, although the internal device performance decreases. As with the overall operating percentage, vc does not change and the operating percentage is good over a wide temperature range. Note that in the circuit state described above, only the voltage booster circuit 2 will operate with the voltage supplied from the outside, but since the voltage booster circuit 2 operates at a much lower frequency than the internal circuit, it can reach a considerably lower voltage. It is easy to design it to be operable, and the chip size VC has almost no effect. As described above, if the present invention is implemented, the internal circuit can be designed to operate at a constant voltage of VDD despite the wide operating range, and the efficiency is very high.
It is possible to design an integrated circuit, and if the operating range is the same, it is possible to design all MO8 integrated circuits with a small chip size.

[Brief explanation of drawings]

Claims (1)

[Claims] It has a voltage booster circuit that boosts the voltage supplied from the outside, a constant voltage circuit that stabilizes the output voltage of the voltage booster circuit, and an internal (b) circuit that is driven by the output voltage of the constant voltage circuit,
An integrated circuit characterized in that said constant voltage circuit has an output voltage temperature range such as to compensate for the operating temperature customization of internal circuitry.