SU942134A1 - Multichannel read-out signal switching device for magnetic storage device - Google Patents

Description

one

The invention relates to computing and can be used in the construction of storage devices on thin magnetic films.

A multichannel readout switchboard is known that is made on channel transistors. The co-current of the known switch is relatively small JQ (hundreds of kilohertz) because of the significant interelectrode capacitances.

The closest technical solution to the proposed one is a multichannel switch of readout signals from ferrite matrices, each containing a transformer, two diodes and resistors in each channel. The switch is designed to switch si | Fees taken from ferrite cores and having an amplitude of several tens of millivolts 2.

The disadvantages of the known switch are low sensitivity, since when switching signals with amplitudes of units of millivolts, the difference in direct voltage drops across the diodes exceeds the amplitude of the read signals, the speed of the output transformer decreases as the frequency increases. circuits of the playback enhancer connected to the output of the switch.

The purpose of the invention is to increase the sensitivity and speed of the switch.

Claims (2)

This goal is achieved by the fact that a multichannel readout switch for magnetic storage devices containing a transformer and a re in each channel. 94 transistor, contains in each channel two transistors of the p-and-p type of conductivity, the emitters of which are switch inputs, between the base and the collector of each transistor is connected the secondary winding of the transformer, one output of which is connected to the zero potential bus and the other through a resistor to the corresponding control input of the switch, the collectors of the first and second transistors, respectively, are combined and are the switch outputs. The drawing shows a principal on the scheme of the proposed switch. The multi-channel readout switch for magnetic storage devices in each channel contains a transformer 1, a resistor 2 connected to a control input. the switch 3, and the two transistors k and 5 p-And-p of the type of the potential. The switch works as follows. The inputs 6, which are the emitters of the transistors 4 and 5 of each channel, receive a signal read from the corresponding read line of the storage device. The control current through the resistor 2 from the control input 3 is supplied to the primary winding of the transformer 1 and unlocks the transistors k or 5 of the selected channel. The output signal is taken from output 7, consisting of a pair of buses, each of which connects the collectors of transistors 4 or 5 of each channel. Thus, the transistors of each channel are turned on by the opposite relative to each other and inversely, which allows to reduce the interference caused by the switching element to 2 mV or less. The test of the proposed switches (collected, for example, on KTS622 transistor matrices and the BTIb transformer block) shows that the switch can switch to the input of the playback amplifier of the corresponding sensitivity read from the discharge lines two-polar signals with amplitude up to 3 mV without any selection of elements. The decrease in the amplitude of the signal at the output of the switch compared to the amplitude at the input due to signal attenuation does not exceed 10. Due to the absence of a transformer connection in the signal path, the speed of the switch increases. Tests have shown reliable switch operation at frequencies up to 1.5 MHz in the temperature range from –60 to. Thus, the use of the proposed switch makes it possible to increase the reliability and speed of magnetic storage devices. A multi-channel readout switch for magnetic storage devices containing a transformer and a resistor in each channel, so that, in order to increase the sensitivity and speed of the switch, it contains in each channel two transistors, p-and-p-type conductors, the emitters of which are switch inputs, have a secondary winding connected between the base and collector of each transistor. The transformer, one output of the primary winding of which is connected to the zero potential bus, and the other through a resistor to the corresponding control input of the switch, collectors of the first and second transistors, respectively, are combined and are the switch outputs. Sources of information taken into account in the examination 1. US patent number 3671951, cl. G 11 C 17/00, published. 1974. 2. Questions of radio electronics. Coll., Ser. EVT. 1968, - Vol.6, pp.3-9 (prototype). ff ffi 6 ff } 6 6 .