PMU 측정 방식을 이용한 이론 및 설계(3)

다음은 적절한 RSENSE 저항을 선택하여 0.1Ω단위로 0.9Ω까지 저항을 연결하여 측정하였으며, 여기서는 Calibration을

하지 않고 바로 측정한 데이타임으로 실제 사용 시에는 가급적 Calibration을 하여 측정하는게 오차율을 줄일 수 있다.

 

● 아래는 RLOAD= 0.1Ω을 ADC로 읽은 데이타이고, 이 데이타를 기반으로 RLOAD를 계산한 결과를 보여준다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17708	17714	17698	17708	17701	17700	17722	17701	17700	17704	17695
VMSR	1.351013	1.351471	1.35025	1.351013	1.350479	1.350403	1.352081	1.350479	1.350403	1.350708	1.350021

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	33	35	37	35	36	31	36	37	36	36	33
VOUT	0.002518	0.00267	0.002823	0.00267	0.002747	0.002365	0.002747	0.002823	0.002747	0.002747	0.002518
ILOAD	0.027074	0.027084	0.027059	0.027074	0.027064	0.027062	0.027096	0.027064	0.027062	0.027068	0.027055
RLOAD	0.092992	0.098594	0.104323	0.098628	0.101486	0.087395	0.101366	0.104305	0.101492	0.101469	0.09306

 

 

● 아래는 RLOAD= 0.2Ω을 ADC로 읽은 데이타이다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17735	17734	17738	17731	17743	17732	17732	17752	17732	17736	17735
VMSR	1.353073	1.352997	1.353302	1.352768	1.353683	1.352844	1.352844	1.35437	1.352844	1.353149	1.353073

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	71	71	71	70	69	71	68	71	70	69	70
VOUT	0.005417	0.005417	0.005417	0.005341	0.005264	0.005417	0.005188	0.005417	0.005341	0.005264	0.005341
ILOAD	0.027116	0.027114	0.02712	0.02711	0.027128	0.027111	0.027111	0.027142	0.027111	0.027117	0.027116
RLOAD	0.199769	0.19978	0.199735	0.197	0.194054	0.199803	0.19136	0.199578	0.196988	0.194131	0.196955

 

 

● 아래는 RLOAD= 0.3Ω을 ADC로 읽은 데이타이다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17358	17349	17367	17363	17339	17361	17345	17365	17356	17279	17351
VMSR	1.32431	1.323624	1.324997	1.324692	1.322861	1.324539	1.323318	1.324844	1.324158	1.318283	1.323776

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	117	113	117	118	118	117	113	116	114	116	117
VOUT	0.008926	0.008621	0.008926	0.009003	0.009003	0.008926	0.008621	0.00885	0.008698	0.00885	0.008926
ILOAD	0.026539	0.026526	0.026553	0.026547	0.02651	0.026544	0.026519	0.02655	0.026536	0.026418	0.026529
RLOAD	0.336346	0.325016	0.336172	0.339123	0.339593	0.336288	0.325091	0.333337	0.32776	0.334996	0.336482

 

 

● 아래는 RLOAD= 0.4Ω을 ADC로 읽은 데이타이다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17273	17353	17357	17369	17363	17352	17369	17359	17372	17364	17371
VMSR	1.317825	1.323929	1.324234	1.32515	1.324692	1.323853	1.32515	1.324387	1.325378	1.324768	1.325302

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	138	137	139	138	137	138	138	138	139	139	138
VOUT	0.010529	0.010452	0.010605	0.010529	0.010452	0.010529	0.010529	0.010529	0.010605	0.010605	0.010529
ILOAD	0.026409	0.026532	0.026538	0.026556	0.026547	0.02653	0.026556	0.026541	0.026561	0.026548	0.026559
RLOAD	0.398668	0.393955	0.399614	0.396465	0.393728	0.396853	0.396465	0.396693	0.399269	0.399453	0.396419

 

 

● 아래는 RLOAD= 0.5Ω을 ADC로 읽은 데이타이다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17249	17336	17333	17347	17339	17321	17337	17343	17327	17344	17339
VMSR	1.315994	1.322632	1.322403	1.323471	1.322861	1.321487	1.322708	1.323166	1.321945	1.323242	1.322861

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	171	172	173	171	173	171	172	172	171	173	173
VOUT	0.013046	0.013123	0.013199	0.013046	0.013199	0.013046	0.013123	0.013123	0.013046	0.013199	0.013199
ILOAD	0.026373	0.026506	0.026501	0.026522	0.02651	0.026483	0.026507	0.026516	0.026492	0.026518	0.02651
RLOAD	0.49469	0.495085	0.49805	0.491895	0.497878	0.492633	0.495057	0.494886	0.492463	0.497734	0.497878

 

 

● 아래는 RLOAD= 0.6Ω을 ADC로 읽은 데이타이다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17339	17352	17331	17337	17332	17339	17339	17335	17307	17336	17321
VMSR	1.322861	1.323853	1.32225	1.322708	1.322327	1.322861	1.322861	1.322556	1.320419	1.322632	1.321487

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	206	204	207	205	206	207	207	208	207	206	207
VOUT	0.015717	0.015564	0.015793	0.01564	0.015717	0.015793	0.015793	0.015869	0.015793	0.015717	0.015793
ILOAD	0.02651	0.02653	0.026498	0.026507	0.0265	0.02651	0.02651	0.026504	0.026461	0.026506	0.026483
RLOAD	0.592848	0.586653	0.596001	0.590039	0.593088	0.595726	0.595726	0.598742	0.596828	0.592951	0.596345

 

 

● 아래는 RLOAD= 0.7Ω을 ADC로 읽은 데이타이다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17333	17329	17339	17339	17257	17331	17330	17346	17335	17321	17329
VMSR	1.322403	1.322098	1.322861	1.322861	1.316605	1.32225	1.322174	1.323395	1.322556	1.321487	1.322098

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	236	240	241	242	241	238	240	239	240	241	240
VOUT	0.018005	0.018311	0.018387	0.018463	0.018387	0.018158	0.018311	0.018234	0.018311	0.018387	0.018311
ILOAD	0.026501	0.026495	0.02651	0.02651	0.026385	0.026498	0.026496	0.026521	0.026504	0.026483	0.026495
RLOAD	0.679421	0.691096	0.693575	0.696453	0.696871	0.685258	0.691056	0.687542	0.690857	0.694296	0.691096

 

 

● 아래는 RLOAD= 0.8Ω을 ADC로 읽은 데이타이다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17525	17532	17538	17527	17516	17528	17517	17532	17534	17434	17527
VMSR	1.337051	1.337585	1.338043	1.337204	1.336365	1.33728	1.336441	1.337585	1.337738	1.330109	1.337204

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	277	278	279	278	276	278	277	277	277	277	279
VOUT	0.021133	0.02121	0.021286	0.02121	0.021057	0.02121	0.021133	0.021133	0.021133	0.021133	0.021286
ILOAD	0.026795	0.026805	0.026814	0.026798	0.026781	0.026799	0.026782	0.026805	0.026808	0.026655	0.026798
RLOAD	0.788719	0.79125	0.793825	0.791476	0.786275	0.791431	0.789079	0.788404	0.788314	0.792836	0.794323

 

 

● 아래는 RLOAD= 0.9Ω을 ADC로 읽은 데이타이다.

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='0'(VMSR)

CODE	17489	17466	17494	17479	17407	17473	17478	17485	17486	17417	17482
VMSR	1.334305	1.33255	1.334686	1.333542	1.328049	1.333084	1.333466	1.334	1.334076	1.328812	1.333771

▶ DAC=1V, RSENSE=499Ω, GAIN=0.1, VI_SEL='1'(VOUT)

CODE	315	316	314	314	314	315	314	314	311	314	318
VOUT	0.024033	0.024109	0.023956	0.023956	0.023956	0.024033	0.023956	0.023956	0.023727	0.023956	0.024261
ILOAD	0.02674	0.026704	0.026747	0.026724	0.026614	0.026715	0.026723	0.026733	0.026735	0.026629	0.026729
RLOAD	0.898765	0.902805	0.895656	0.896424	0.900132	0.899588	0.896476	0.896117	0.887504	0.899615	0.907688