摘要:
A trigger circuit (20, 50, 80, 90, 100) suitable for triggering an oscilloscope on the occurrence of a limited amplitude input signal includes a first comparator (38) for comparing an input signal to a first, low threshold voltage and for generating a first logic signal, and a second comparator (40) for comparing the input signal to a second, high threshold voltage and for generating a second logic signal. The first and second logic signals are combined in a flip-flop circuit (25) to provide an output logic signal such that the output signal changes logic state subsequent to the input signal crossing and recrossing the first, low threshold voltage without crossing the second, high threshold voltage.
摘要:
A voltage controlled oscillator includes an emitter coupled multivibrator in which a capacitor determines the frequency of oscillation along with a pair of load resistors (14, 15) and a pair of current sources (16, 17). A differential amplifier (20, 21) is coupled to operate in parallel with the multivibrator and its tail current is operated differentially, with respect to the currents in the pair of sources (16, 17), in response to the input voltage at a first modulation input port. Thus, a constant current flows in the multivibrator loads even when the frequency is modulated. A second input port is coupled to vary the tail current in the differential amplifier to comprise a dual port control of the voltage controlled oscillator. The circuit can be operated at a relatively low supply voltage and can be temperature compensated. Furthermore, the input ports can include circuitry having a logarithimic response for digital signaling processing.
摘要:
A trigger circuit (20, 50, 80, 90, 100) suitable for triggering an oscilloscope on the occurrence of a limited amplitude input signal includes a first comparator (38) for comparing an input signal to a first, low threshold voltage and for generating a first logic signal, and a second comparator (40) for comparing the input signal to a second, high threshold voltage and for generating a second logic signal. The first and second logic signals are combined in a flip-flop circuit (25) to provide an output logic signal such that the output signal changes logic state subsequent to the input signal crossing and recrossing the first, low threshold voltage without crossing the second, high threshold voltage.
摘要:
Kippschaltung mit einem emittergekoppelten und aus einer ersten Stromquelle (S1) gespeisten ersten Transistorpaar (TP1), in desen Lastkreise jeweils Lastwiderstände (R1, R2) geschaltet sind, dessen einer Eingangskreis mit einem Referenzpotential (VR) und dessen anderer Eingangskreis mit einem Eingangssignal (E) beaufschlagt ist, mit einem emittergekoppelten und aus einer zweiten Stromquelle (S2) gespeisten zweiten Transistorpaar (TP2), dessen Lastkreise direkt und dessen Eingangskreise über Kreuz mit den entsprechenden Lastkreisen des ersten Transistorpaares (TP1) gekoppelt ist und mit einem emittergekoppelten und aus einer dritten Stromquelle (S3) gespeisten dritten Transistorpaar (TP3), in dessen Lastkreise jeweils weitere Lastwiderstände (R3, R4) geschaltet sind und dessen Eingangskreise mit den entsprechenden Lastkreisen des ersten Transistorpaares gekoppelt sind.
摘要:
There is disclosed an ADC (18) including a comparator (40) which sets, bit-by-bit, a successive approximation binary register (42). Feedback means (42, 44, 48) for auto-biasing, auto calibration, and offset compensation within the ADC (18) are provided. The ADC (18) sets itself to a high degree of accuracy automatically by reference to a master voltage reference. A number of identical ADCs (18) are connected in parallel to provide an increased sampling rate. The ADC (18) architecture compensates for component tolerance differences, for common mode noise, and for secondary parasitic effects. The ADC (18) operates with high resolution at high speed (e.g., 10 bits at 50 MHz), and can be implemented in MOS technology with good integrated circuit chip yield and is compatible with new ASICs.