Reference no: EM131345209
Current Switching DAC The circuit in given Figure is a four-bit DAC. The DAC output is the voltage vO and the input is the binary code represented by bits b1, b2, b3, and b4. The input bits are either 0 (low) or 1 (high), and each controls one of the four switches in the figure.
When bits are low, their switches are in the left position, directing the 2R leg currents to ground. When bits are high, their switches move to the right position, directing the 2R leg currents to the OP AMP's inverting input. The 2R leg currents do not change when switching from left to right because the inverting input is a virtual ground ð Þ vN = vP = 0 . The purpose of this problem is to show that this constantcurrent switching produces the following input-output relationship.
(a) Since the inverting input is a virtual ground, show that the currents in the 2R legs are i1 = VREF/2R, i2 = VREF/4R, i3 = VREF/8R, and i4 = VREF/16R, regardless of switch positions.
(b) Show that the sum of currents at the inverting input is
b1 i1 + b2 i2 + b3 i3 + b4 i4 + iF = 0 where bits bk(k = 1, 2, 3, 4) are either 0 or 1.
(c) Use the results in parts (a) and (b) to show that the OP AMP output voltage is
|
Examine the various kinds of interactions
: Examine the various kinds of interactions that happen within each of the 4 (micro, meso, exo, macro) systems/levels
|
|
How does the structure of your understanding work
: Explore the way that you have viewed the "social order." How does the structure of your understanding work? Give an example. Give an example or two of how a different paradigm challenges your understanding of the "social order."
|
|
Weathervane azimuth detection
: As the vane turns clockwise from N to NW, additional LEDs come on. If the vane turns counterclockwise, the LEDs go off as it turns. You have available a 15-VDC supply.
|
|
Gender dichotomy and hierarchy in our society
: How is the gender dichotomy and hierarchy in our society, as discussed by Newman and the film, reinforced by societal institutions such as the paid labor force, religion, media and the family? Provide examples to illustrate your argument Be sure t..
|
|
Show that the op amp output voltage is given
: Since the inverting input is a virtual ground, show that the currents in the 2R legs are i1 = VREF/2R, i2 = VREF/4R, i3 = VREF/8R, and i4 = VREF/16R, regardless of switch positions.
|
|
Who suffers the most from cultural lag and why
: Who suffers the most from cultural lag and why? What are some of the long term effects of this phenomenon?
|
|
Incorporate the six pillars of character
: Read the scenario provided below and incorporate the six pillars of character as you address a possible solution - What possible issues/concerns might this scenario raise
|
|
Discuss about the case given below
: A new type of home-based elder care model, called Virtual Elder Care Home or Elder Care Home without Walls, has gained popularity in China.It features home care agencies providing a wide range of personal care and homemaker services in elders' hom..
|
|
Sociologist rae blumberg said that the central principle
: In her introduction to a paper about gender, the sociologist Rae Blumberg said that the central principle behind gender in our society is "remember the golden rule: he who has the gold makes the rules." What kind of theorist is Blumberg?
|