JPH03154295A - Sense amplifier circuit - Google Patents

Abstract

PURPOSE:To maintain a low output power supply current even when external supply power supply voltage becomes high by providing many amplifier drives Tr for low output current and to improve noise resistance when activating a sense amplifier by a one shot pulse, and deciding its on/off in accordance with the Vcc fluctuation. CONSTITUTION:A circuit with two Tr's Q5 and Q6 parallelly is provided at a sense amplifier circuit, the Q5 is surely turned on by a phi3 when activating the sense amplifier circuit, and operation is decided for the output phi8 of a Vcc fluctuation detection circuit is decided for the Q6. That is, only when the phi8 becomes 'L', that is, the Vcc becomes equal to or lower than a certain value, both of the Q5 and Q6 are turned on and the sense amplifier circuit is operated, but when the Vcc increases and the phi8 becomes 'H', a phi12 is made 'L' and the Q6 is turned off, and the peak value of the output current is reduced. Thus, the output current which flows when activating the amplifier is controlled to an optimum value in accordance with the fluctuation of the electric current voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sense amplifier circuit used in a semiconductor memory device.

[Conventional technology]

Conventional dynamic random access memory (DR)
AM) uses a sense amplifier circuit to amplify the binary information stored in the memory cell capacitance, outputs it to the outside, or writes the binary information into the memory cell capacitance by inputting data from the outside. is performing an action. Next, the operation of a sense amplifier when reading data from a conventional DRAM will be explained. Conventional output preamplifier and storage amplifier t-#! Shown in Figure 4. Next, we will explain the operation of the bit line pair connected to the memory cell capacitance.The signal amplified by the sense amplifier is transmitted to the 10th line, but a large load is involved in reaching the data output from the 1st line. Is it necessary to amplify data at high speed in order to improve history?

Therefore, we used a preamplifier and a main amplifier to increase the signal 111! Do this. Recently, 0M08 circuits have become mainstream for preamplifiers, so many bottles use highly sensitive current mirror output capriamps. FIG. 5 shows the case of data reading at the early stage timing of the current mirror type output amplifier shown in FIG.

First, before selecting a bit line pair,
I- is equalized to the same potential by the Ilo line equalization signal ψ1, and -s6 is also at this time, since the convolution activation signal ψ2 is also 1H', so it cannot be used as an input signal.
Transistor (hereinafter referred to as 'rr) (Ia) (1'b
) In the ld ionic state, Ilo, Ilo tri
Trl 1a), (lb) threshold 1 direct pressure VT[iN
Then, it is precharged to IN with the 4-source voltage Vcc-V.

When the I/6 line is connected to a specific bit line selected by the column address when the column selection signal p7 becomes 1H1, the I/10 line connected to the bit line on the Lo@ side becomes L. (Step 10) The bare potential decreases.

Next, the Φ3 signal of the preamplifier becomes l Hl and the node (
■ is pulled to the ground side. For example, if we consider the case where the potential of the engineering 10 soul becomes lower than that of the engineering 10 @, the potential of the node [phase] is lower than that of the node ■, so Tr
(Lf), (If is TI-(1e).

The comparative Beon state becomes weaker at (lh). Therefore, the node,
Compared to ψ and ■, the potential of Benode @1 becomes a sieve, and Tr
(2c), (2d) v′iTr (2e), (gf)
The Beon state becomes weaker than before. As a result, the node ■ tries to rise even higher, and the node ■ tries to fall further lower. Tr (lj) = (Jk) - (2h) - (21)
The same operation is performed for ψ4 (output), and a value of 1L1 is outputted to ψ4 (output). This output is transmitted to the output main amplifier via an inverter buffer (31).

When the Φ3 signal becomes "Ll", the nodes ■ and ■ become 'H1' and the preamplifier is inactivated, and at this time, the Φ4 also becomes Tr C2.
1F) Photoelectrically charged to IHllllllI by VC.

The output signal Φ4 of the offset data is latched to the output main amplifier while the preamplifier is activated, and the output signal Φ4 is
Even if the 4 signals are precharged, the output data is retained in the main amplifier. Father, when starting the thread, ψ5. Φ6
Both signals are 'L1' and data is not stored.

The above is a description of the operation of the current mirror type m capriamp at the time of Re&d (reading), but generally the output [15
The dog component of 1E is Tt (li) when the preamplifier activation signal is in the active state of 1H''.

(1/) t'', the pulse width of the one-shot pulse such as the preamplifier activation signal Q3 should be optimized, and after the level of the output ψ4 is determined (current In the example, the level ft@Hl is not set unnecessarily (determined to be "L level"), so that the output current is completely reduced.

[Problem to be solved by the invention]

The sense amplifier activated by a one-shot pulse, such as the current mirror type sense amplifier used in Takumi's preamplifiers, was configured as described above, so the one-shot pulse ψ3 generation circuit was used to generate the final stage of the signal. As shown in Figure 6, the buffer section is usually configured in the form of cascade connections such as inverters (8b), C8 (aa, ae, and 8f), so the waveform of Q3 is usually As a result, the output power supply current shows a dependence as shown in Fig. 7 on the voltage amplification.As a result, the output power supply current shows a difference as shown in Fig. 8.As shown in Fig. 8, as the VC power supply voltage increases, , the output power supply current's peak current increases and its 1! current pulse width becomes shorter.At this time, especially in multi-output semiconductor integrated circuits, when high VCO, metal power supply wiring of integrated circuit devices, etc. An induced noise voltage dld occurs due to the inductance component contained in the inductance component.However, 1,4tt indicates the output power supply current d1 which changes by i)K per minute time dt.

These induced noise voltages are caused by the capacitance M due to the strange occurrence between the wirings, etc. ! It appears as a noise voltage at the circuit nodes of the circuit, causing malfunction. There are problems such as waking up.

This invention was made to solve the above-mentioned problems, and provides a sense amplifier circuit that maintains the 11L output current even when the external supply voltage increases, and has improved noise resistance. 5! [Determined Means to Solve All Problems] The sense amplifier circuit according to the present invention achieves low output current, low output current, and
In order to improve the noise resistance, multiple sense amplifier drivers 4@Tr are installed, and their on/off control is controlled.
s Vcc Rm Vch.

[Effect]

The sense amplifier circuit according to the present invention activates the sense amplifier by a one-shot pulse to Vca [low output current that can suppress the peak level of output current when the source voltage rises; improves noise resistance. .

[Dog FM]

Hereinafter, an explanation will be given using a purple diagram of an example of this invention.

FIG. 1 is a circuit diagram of a VCC subassembly detection circuit used in a sense amplifier circuit which is an embodiment of the present invention, and FIG.
An explanatory diagram of the Vco pre-change voltage transformation detection circuit shown in the figure is shown.

Next, the operation will be explained. In Fig. 8, the potential of R2 is the dragon source voltage If VOQ k If the resistance of R1 and R2 is also V
When cc increases and the state a is detected, the threshold value t of inverter 1 - its R corresponds to a certain Vcc level.
□You can set it to the level twice as high as 10R. The situation is shown in Figure 2. In other words, the state of node n1 is different from the conventional VcO in FIG. 7! In the l&11 detection circuit, from ILl to 'H
The output of node n1 is changed to ``!''.
Make it meat.

Next, FIG. 3 showing an embodiment of the invention will be described.

In FIG. 3, the conventional sense amplifier activation 'rr is Q, 5.
Q6 Each channel width W/2 is connected in parallel with two transistors, but if there is only one transistor with channel width W and 9, then the conventional sense amplifier activation one as shown in FIG. When Vcc increases with shot pulse ψ3,
With this in mind, a large discharge current flows, but in Fig. 8, two Tr Q5#Q6 are connected in parallel, and TrQ5 is always turned on by φ3 when the sense amplifier is activated. , for TrQa, the above-mentioned Vc
The circuit configuration is such that the variable variable detection circuit power is determined by -8. In other words, even if φ3 becomes 1R1, if φ875;
Only when it is 111 or less, Q5. The M side of Qe is turned on and the sense amplifier circuit r operates, but Vca increases and R1
3 is 1H" and ψa becomes 'H' at 9 o'clock, ψ12 is lL
TrQa is turned off and only the width r'fr of the conventional A is turned on, so that the peak sound of the output current can be suppressed compared to the conventional one.

This (+- is shown in the truth table in Table 1.

Table 1 [Effects of the Invention] As described above, according to the present invention, in the sense amplifier circuit, the output current flowing when the sense amplifier is activated is controlled to the optimum temperature according to the change #VC of the first current voltage. Therefore, the output current 'fir: can be realized and the noise resistance can be improved.

[Brief explanation of the drawing]

Figure 1 shows the Vc used in the amplifier circuit of this invention.
A circuit diagram showing one embodiment of the a5 young detection circuit, FIG.
FIG. 8 is an explanatory diagram of the operation of the Vcc variable #J imitation circuit shown in FIG.
Fig. 4 is an explanatory diagram of the operation of a sense amplifier circuit activated by a conventional funshot pulse, Fig. 5 is the ninth signal waveform diagram of the operation explanation of Fig. 4, and Fig. 6 is a diagram of the conventional sense amplifier activation. The configuration diagram of the output stage of the signal and one-shot pulse e3 is shown in FIG. 7, and the '4 exact ratio Vcc of ψ3 in FIG.
The dependence waveform diagram, Figure 8, shows the V of the m#'ilE style waveform that is distorted by the activation of the sense amplifier by the ψ3 node in Figure 6.
It is a waveform diagram of aa dependence. In the figure, (8h) is a 0M0S inverter, (4) is an N
AND circuit, work 1 work 2 is inverter, nen2 is node, QI Q, 2 is p-type MO8Tr %Q3~Q, a is n
Type MO8Tr, RI Ra exhibits resistance. In addition, in FIG. 1, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a sense amplifier circuit that inputs two signals so as to have a complementary relationship with each other in binary numbers, amplifies the potential difference between them, and outputs either or both of the desired binary states, the sense amplifier circuit has a one-shot pulse. It consists of a sense amplifier activation MOS transistor group in which at least two or more MOSTrs are connected in parallel, each having a gate input of At the same time as the amplifier activation one-shot pulse state, V
A sense amplifier circuit characterized in that a sense amplifier circuit is determined according to fluctuations in cc.