摘要:
To reduce the D.C drift of bucket-brigade devices having common output circuits (emitter follower), an output circuit is provided having an additional transistor and an additional capacitor. The terminal on the gate side of the capacitor associated with the last delaying transistor is not connected to the gate terminal but to the source terminal of the output transistor, the gate terminal of the terminating transistor is applied via the additional capacitor to that particular clock signal to which the penultimate delaying transistor is applied, and the drain terminal of the terminating transistor, via an enhancement-type transistor of the same conductivity, connected as a diode by directly connecting both the drain and the gate terminals, is connected to the gate terminal thereof.
摘要:
The invention is the structure and process for making a bucket brigade device which comprises the merger of an MOS capacitor with an MOSFET device to form the charge transfer cell. A thin n-type region is implanted in a portion of the p-type channel region of an FET device adjacent to the drain diffusion. This structure increases the charge transfer efficiency for the cell and reduces its sensitivity of the threshold voltage to the source-drain voltage. The gate for the device has a substantial overlap over the drain and a minimal overlap over the source and the gate to drain capacitance per unit area is maximized by maintaining a uniformly thin oxide layer across the gate region.
摘要:
Charge transfer memories such as those of the bucket-brigade or of the charge-coupled device (CCD) type include, at each location, a store which is separate from the normal means for charge storage. Charge is transferred from the normal means of storage to the separate store at each location during a first period of time and may be sensed during later intervals of time to provide multiple "copies" of the stored information. In one form of such a memory especially suitable for the storage of digital data, each separate store includes an internal loop for refreshing the charge. In other forms of such memories, means are provided for reducing the effects of variation in threshold voltage from location-to-location of the transistors associated with the separate stores. These are especially suitable for analog storage.
摘要:
A charge transfer circuit for amplifying relatively low signal levels. The circuit includes a charge transfer register for propagating a charge signal along the register. Amplifying means are coupled along the register for sensing and amplifying the charge signal. The outputs of the amplifying means are then summed to produce an output signal having a high signal-to-noise ratio.
摘要:
A sensor array having photosensitive elements formed as an integral part of each stage of a shift register chain. Each stage has charge storage means. The photosensitive elements are coupled to the charge storage means for discharging them as a function of externally applied photo signals and, consequently, developing charge deficits in said charge storage means. The shift register, in response to a clocking signal, transfers the charge deficits from one stage to the next along the chain producing a serial output signal at an output terminal.
摘要:
A sensor array having photosensitive elements formed as an integral part of each stage of a shift register chain. Each stage has charge storage means. The photosensitive elements are coupled to the charge storage means for discharging them as a function of externally applied photo signals and, consequently, developing charge deficits in said charge storage means. The shift register, in response to a clocking signal, transfers the charge deficits from one stage to the next along the chain producing a serial output signal at an output terminal.
摘要:
A device for converting energy patterns in the form of pressure, heat or magnetic images into an electrical signal as a function of time where the necessity for a scanning beam or a crossed bar readout system is eliminated by cascading elements which function as both storage and energy sensitive devices and by providing circuitry for shifting the charges of the energy sensitive storage elements in a single direction along the cascaded array.
摘要:
An MOS bucket-brigade device (BBD) fabricated with two layers of polycrystalline silicon is disclosed. Each stage includes a pair of spaced-apart regions, one of which is formed in a well. A holding stage is employed which includes a lightly doped substrate region which reduces junction capacitance.
摘要:
A semiconductor filtering apparatus substantially fabricated as a metal-oxide-semiconductor (MOS) integrated circuit that permits discrete time correlation or convolution of an analog input signal with a binary or analog correlating signal. The apparatus may also be employed as a recursive filter. A plurality of novel bucket-brigade charge transfer means are employed to shift the input analog signal past non-destructive read-out taps. Electrically programmable floating gate devices are used to store either a binary or analog correlating signal. The sum or difference signal associated with each of the plurality of charge transfer means is weighted to produce the final filter output in one embodiment.
摘要:
An MOS bucket brigade delay line having reduced parasitic capacitances include a first set of diffused drain source regions in a semiconductor substrate, a thin gate oxide layer overlying said diffused regions, a plurality of gate electrodes having first and second edges, the first edge of each electrode substantially overlapping one of said diffused regions, each of these elements formed in conventional manner. A second set of diffused drain-source regions extends the first set of regions by an amount limited by the second edge of the gate electrodes. The second set of drain source regions is formed by utilizing the gate electrodes as a diffusion mask.