Programmable Logic Design I
Introduction
In labs 11 and 12 you built simple logic circuits on breadboards using TTL logic circuits on 7400 series chips. This process is simple and easy for small circuits. With increasing complexity of the logic circ
Problem HH 4.4
Use an op-amp and a 1mA (full scale) meter to construct a "perfect" ammeter (i.e. one with zero input impedance) with 5mA full scale. Design the circuit so that the meter will never be driven more than 150% full scale. Assume that the
Problem HH8.2
Convert to decimal: a) 1110101.01102 b) 11.01010101.2 c) 2AH Convert to binary: a) 102310 b) 1023H Convert to hexadecimal: a) 102310 b) 1011101011012 c) 6145310
Problem HH8.9
Show how to make: a) A 3-input AND from 2-input ANDs b) A 3-input OR from 2-input ORs c) A 3-input NOR from 2-input NORs and d) A 3-input AND from 2-input NANDs
Problem HH8.17
Show how to make a 4-input multiplexer using: a) Ordinary gates b) Gates with 3-state outputs and c) Transmission gates. Under what circumstances would c) be preferable?
Problem HH 1.30
Diode clamps are used to protect delicate electronic circuits, especially CMOS, from the effects of overvoltage. The figure below shows such a clamp that limits the output voltage to +5.6 V. Design a symmetrical clamp that limits the
Problem HH 5.2
Show that the circuit in the drawing below is a gyrator, in particular that Zin = R2/Z. Hint: you can analyze it as a set of voltage dividers, beginning at the right.
Problem HH 1.5
Show that it is not possible to exceed the power rating of a watt resistor of resistance greater tan 1 k, no matter how you connect it, in a circuit operating from a 15 volt battery.
Problem HH8.31
Consider the vending machine described by the state diagram in problem HH8.30. Good vending machines give change. Redraw the state diagram so that there are states (how many?) for each possible amount of change. Modify the transition r
Problem HH 1.27
Design a full-wave bridge rectifier circuit to deliver 10 volts dc with less than 0.1 volt (pp) ripple into a load drawing up to 10 mA. Choose the appropriate ac input voltage (by means of a transformer) assuming 0.6 volt diode drops.
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Problem HH 1.9
For the circuit shown in the Figure below, with Vin = 30V and R1 = R2 = 10k, find:
1. The output voltage with no load attached (this is the open-circuit voltage).
2. The output voltage with a 10k load (treat as voltage divider, with
Problem HH9.4
Design a circuit to generate a 10kHz train of pulses of width proportional to an 8-bit binary input code. Use counters and magnitude comparators (suitably expanded).
Problem HH8.32
Draw a state diagram and transition rules for an electronic combination lock: It should open only if four digits are entered in the correct order. Any error in the sequence should reset it and the entry process should proceed from the
Problem HH4.10
Design a Schmitt trigger using a 311 comparator (open-collector output) with thresholds at +1.0 volts and +1.5 volts. Use a 1.0k pullup resistor to +5 volts, and assume that the 311 is powered from 15 volt supplies.
Problem HH 1.29
A useful application of diodes is to pass the higher of two voltages without affecting the lower. An example of this is battery backup, a method of keeping something running (e.g. a precision electronic clock) that must not stop when
Problem HH 2.3
The simplest regulated supply of voltage is a zener such as in the figure below.
Some current must flow through the zener so you choose:
Vin " Vout > Iout (max) R
Because Vin is not regulated, you use the lowest value of Vin that mig
RLC Circuits Note: Parts marked with * include calculations that you should do before coming to lab. In this lab you will work with an inductor, a capacitor, and a resistor to demonstrate concepts of low-pass, bandpass, and high-pass filters, amplitu
Bipolar transistors II, Page 1 Bipolar Transistors II Transistor circuits can be used to obtain stable sources of constant voltage. The following sections trace the development of a simple voltage source using a single transistor. Items marked with a
RC and RL Circuits Page 1
RC and RL Circuits
RC Circuits In this lab we study a simple circuit with a resistor and a capacitor from two points of view, one in time and the other in frequency. The viewpoint in time is based on a differential equatio
Problem HH 5.1
Show that the circuit in the Figure below is a negative impedance converter (NIC), in particular that Zin = -Z. Hint: Apply some input voltage V, and compute the input current I. Then take the ratio to find Zin = V/I.