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--- university:courses:alm1k:alm-lab-16 [27 Jul 2018 15:16] – [Directions:] Doug Mercer
+++ university:courses:alm1k:alm-lab-16 [18 Dec 2021 16:38] (current) – add external article link Doug Mercer
@@ Line 1: / Line 1: @@
-======Activity 16: Capacitor Based DC-DC Converters======
+======Activity: Capacitor Based DC-DC Converters - ADALM1000======
 =====Objective:=====
@@ Line 11: / Line 11: @@
 Scope traces are similarly referred to by channel and voltage / current. Such as CA-V , CB-V for the voltage waveforms and CA-I , CB-I for the current waveforms.
-The circuits used in this Lab activity while generally low current can produce voltages beyond the 0 to 5 V analog input range of the ALM1000. Input voltage divider techniques as discussed in the document on ALM1000 analog inputs will be required. Refer to the document and construct and use input dividers before preforming any of these experiments with the ALM1000.
+The circuits used in this Lab activity while generally low current can produce voltages beyond the 0 to 5 V analog input range of the ALM1000. [[university:courses:alm1k:circuits1:alm-measure-outside-0-5-range|Input voltage divider techniques]] as discussed in the document on ALM1000 analog inputs will be required. Refer to the document and construct and use input dividers before preforming any of these experiments with the ALM1000.
 =====Concept:=====
@@ Line 32: / Line 32: @@
 Solder-less breadboard and jumper wire kit\\
 – 1 MΩ resistor\\
-– 470 KΩ resistor\\
 – 200 KΩ resistor\\
-– AD8541 rail-to-rail CMOS op-amp ( or ½ dual AD8542 )\\
+– ZVN2110A NMOS FET ( 2N7000 )\\
-– ZVN2110A NMOS FET ( 2N7000 )\\
+– ZVN3310 NMOS FET ( 2N7000 )\\
+– ZVP2110A PMOS FET\\
 – 74HC04 HEX CMOS Inverters ( CD4007, CD4069 )\\
+– LT1054\\
 – 10uF capacitors\\
 – 220uF capacitor\\
-– 1N914 small signal diodes
+– 1N914 diodes (1N4001 or 1N5819 Schottky diodes)
 //Additional Equipment://
 Small handheld DMM ( optional )\\
-+5 V bench power supply or 4.5 V battery ( 3 x AA cells )
++5 V bench power supply or 4.5 V battery ( optional )
 ====Directions:====
@@ Line 78: / Line 79: @@
 ====Hardware Setup:====
-The digital pulse source ( details below ) output should generate a 50% duty cycle square wave at least 20 KHz output frequency. The input of scope channel CA-V with an external resistor divider is used to measure the waveform seen at the drain of M<sub>1</sub> and the second scope channel CB-V with an external resistor divider can be used to measure the waveform seen at the drain of M<sub>2</sub>.
+The V<sub>Clock</sub> pulse can be supplied from the Channel A output or the digital pulse source circuit (details below in figure 8) and should generate a 50% duty cycle square wave with at least a 20 KHz output frequency. The input of scope channel CB-V with the external resistor divider is used to measure the waveform seen at the drain of M<sub>1</sub> and to measure the waveform seen at the drain of M<sub>2</sub> and to measure the V<sub>Boost</sub> output voltage.
 ====Procedure:====
@@ Line 102: / Line 103: @@
 ====Directions:====
-The breadboard connections for another version are as shown in figure 6 below. A second package of CMOS inverters is used for the upper set of switches (INV3 and INV4) rather than the discrete FETs and diodes. The ground connection of the second 74HC04 is connected to the V<sub>IN</sub> node and the supply connection at pin 14 becomes the V<sub>Boost</sub> node. The DMM should be connected to measure the voltage at V<sub>Boost</sub>. The +5V bench power supply should be connected to the V<sub>IN</sub> node. The digital pulse source output drives the input of the first Inverter gate at pin 1.
+The breadboard connections for another version are as shown in figure 6 below. A one package of CMOS inverters is used for the upper set of switches (INV1 and INV2) rather than the discrete FETs and diodes. The ground connection of the 74HC04 at pin 7 is connected to the VIN node and the supply connection at pin 14 becomes the V<sub>Boost</sub> node. The voltage divider input should be connected to measure the voltage at V<sub>Boost</sub>. The +5V power supply should be connected to the V<sub>IN</sub> node. The LT1054 is used as both the clock digital pulse source and first driver output for capacitor C<sub>1</sub> and drives the input of the Inverter at the gates of NMOS M<sub>1</sub> and PMOS M<sub>2</sub>.
 {{ :university:courses:alm1k:alm-lab16_f6.png?550 |}}
@@ Line 108: / Line 109: @@
 <WRAP centeralign>Figure 6 All CMOS Inverter configuration</WRAP>
-Figure 7 shows an inverting DC-DC configuration that produces V<sub>Boost</sub> equal to –V<sub>IN</sub>. The second 74HC04 is connected below ground as shown to produce a V<sub>Boost</sub> that is equal to –V<sub>IN</sub>.
+Figure 7 shows an inverting DC-DC configuration that produces V<sub>Boost</sub> equal to –V<sub>IN</sub>. The 74HC04 is connected below ground as shown to produce a V<sub>Boost</sub> that is equal to –V<sub>IN</sub>.
 {{ :university:courses:alm1k:alm-lab16_f7.png?550 |}}
@@ Line 128: / Line 129: @@
 **For further reading:**
-http://en.wikipedia.org/wiki/DC-to-DC_converter\\
+[[adi>en/analog-dialogue/articles/the-interleaved-inverting-charge-pump-part-1.html|The Interleaved Inverting Charge Pump—Part 1: A New Topology for Low Noise Negative Voltage Supplies]]\\
-http://en.wikipedia.org/wiki/Charge_pump\\
+[[http://en.wikipedia.org/wiki/DC-to-DC_converter|Dc-DC Converter]]\\
-http://www.analog.com/static/imported-files/data_sheets/ADM660_8660.pdf
+[[http://en.wikipedia.org/wiki/Charge_pump|Charge Pump]]\\
+[[https://www.radiolocman.com/review/article.html?di=619561|Capacitive voltage conversion aka the charge pump]]\\
+[[adi>static/imported-files/data_sheets/ADM660_8660.pdf|ADM660,8660 Data Sheet]]
 ====Appendix:====

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