Patent US4049491A successfully refreshed from Google Patents.
EP0143699A2
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Bus transceiver
Assignee: Digital Equipment Corp
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Filing: 1984-11-16
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Granted: —
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Expires: 2004-11-16
Abstract
Abstract A bus transceiver having a driver (4) charging/discharging characteristics that are device-independent and a receiver (6) that provides adequate noise immunity is described. The transceiver uses a reference network to modulate the conductance of a depletion device as a function of device parameter variations in order to maintain a constant response time for the driver and optimize peak current. The receiver uses a modified differential amplifier to provide high gain and hysteresis sufficientfor a desired level of noise immunity.
Inventors
- 👤 Wayne C. Parker
- 👤 John W. May
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 19:49
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/0264; H04L25/028; G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068; G06F13/4072; H03; H03K; H03K19/00; H03K19/003; H03K19/00369; H03K19/00384; H03K19/0175; H03K19/0185; H03K19/018507; H03K19/02; H03K19/08; H03K19/094; H03K19/0944; H03K19/09441; H03K19/09443; H03K19/09445; H04L25/0292; H04L25/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A bus transceiver system in a monolithic integrated circuit comprising: a plurality of driver stages connected to a common output pad, each driver stage capable of driving a corresponding signal onto the external bus line connected to said pad; a plurality of pre-driver stages, each pre-driver stage connected to a corresponding one of said driver stages; a voltage reference network coupled to each of said pre-driver stages . to control the electrical characteristic of said pre-driver stage as a function of the variation in electrical characteristics of said pre-driver and driver stages; and at lease one receiver stage including high-gain means for producing a restored high-state/low-state voltage output as a function of an input signal.
Claim 2
Dependent Claim
115 words
A bus transceiver system in a monolithic integrated circuit comprising: a plurality of driver stages connected to a common output pad, each driver stage capable of driving a corresponding signal onto the external bus line connected to said pad; a plurality of pre-driver stages, each pre-driver stage connected to a corresponding one of said driver stages; a voltage reference network coupled to each of said pre-driver stages . to control the electrical characteristic of said pre-driver stage as a function of the variation in electrical characteristics of said pre-driver and driver stages; and at lease one receiver stage including high-gain means for producing a restored high-state/low-state voltage output as a function of an input signal.
Claim 3
Dependent Claim
64 words
A bus receiver system in a monolithic integrated circuit comprising: a differential amplifier having its inverting output fed back to its inverting input; sampling means for coupling a bus signal to the non-inverting input of said differential amplifier during a sample interval; and a switchable feedback path for connecting the non-inverting output to said non-inverting input between sample intervals for latching the input data.
Claim 4
Dependent Claim
64 words
A bus receiver system in a monolithic integrated circuit comprising: a differential amplifier having its inverting output fed back to its inverting input; sampling means for coupling a bus signal to the non-inverting input of said differential amplifier during a sample interval; and a switchable feedback path for connecting the non-inverting output to said non-inverting input between sample intervals for latching the input data.
Claim 5
Dependent Claim
74 words
A bus driver system in a monolithic integrated circuit comprising: at least one driver means connected to an output pad for driving a signal onto the external bus; a pre-driver stage capable of driving said driver means; and voltage reference means coupled to said pre-driver stage for controlling the resistance in the driving path of said pre-driver stage as a function of variations of electrical characteristics of said pre-driver stage and said driver means.
Claim 6
Dependent Claim
74 words
A bus driver system in a monolithic integrated circuit comprising: at least one driver means connected to an output pad for driving a signal onto the external bus; a pre-driver stage capable of driving said driver means; and voltage reference means coupled to said pre-driver stage for controlling the resistance in the driving path of said pre-driver stage as a function of variations of electrical characteristics of said pre-driver stage and said driver means.
Claim 7
Dependent Claim
102 words
The driver of claim 3 wherein said voltage reference means comprise: a differential amplifier; a voltage reference coupled to a first input of said differential amplifier; a compensating means, including at least one active element of each type present in said pre-driver and driver stage and a corresponding external precision reference element for each type, for generating a voltage proportional to the electrical characteristics of said active elements, said voltage being coupled to a second input of said differential amplifier;and buffering means for producing a control signal as a function of the voltage difference between the two differential am p lifer's outputs.
References Cited (Backward Citations)
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